user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: where does the potomac river flow into? 
Knowledge Triplets: Maryland, location.location.partially_contains, Chester River
Maryland, location.statistical_region.religions, m.04406t3
Clinch River, location.location.containedby, United States of America
Potomac River, geography.river.mouth, Chesapeake Bay
Maryland, location.location.partially_contains, Potomac River
Powell River, location.location.partially_containedby, Tennessee
Woodrow Wilson Bridge, transportation.bridge.body_of_water_spanned, Potomac River
Choptank River, location.location.partially_containedby, Maryland
m.07nh392, base.ontologies.ontology_instance_mapping.freebase_topic, Potomac River
Potomac River, location.location.containedby, Mid-Atlantic states
Monongahela River, location.location.partially_containedby, West Virginia
Maryland, location.administrative_division.country, United States of America
Potomac River, location.location.contains, Point Lookout Light
Shenandoah River, location.location.partially_contained_by, m.0wg8pgj
Smith River, location.location.partially_contained_by, m.0wg8p0d
Potomac Palisades Site, location.location.containedby, Potomac River
Susquehanna River, location.location.partially_containedby, Maryland
Maryland, book.book_subject.works, The Hollow
Maryland, location.location.partially_contains, North Branch Potomac River
West Virginia, location.location.partially_contains, Shenandoah River
Clinch River, geography.river.basin_countries, United States of America
Maryland, location.location.adjoin_s, m.02thrj4
Maryland, location.location.partially_contains, Choptank River
Susquehanna River, location.location.partially_containedby, New York
Maryland, book.book_subject.works, Sons of Liberty
New River, location.location.partially_contained_by, m.0wg8p4p
Nanticoke River, geography.river.mouth, Chesapeake Bay
River, common.topic.article, m.021y5gc
Youghiogheny River, location.location.containedby, North America
South Branch Potomac River, location.location.containedby, North America
West Virginia, location.location.partially_contains, Potomac River
Maryland, location.statistical_region.religions, m.04405g2
Potomac River, common.topic.article, m.0g52s
Maryland, location.location.partially_contains, Marshyhope Creek
Maryland, location.location.partially_contains, Evitts Mountain
Maryland, location.location.events, 2011 Chesapeake Film Festival
Maryland, book.book_subject.works, Antietam
Ararat River, location.location.partially_containedby, North Carolina
Maryland, location.location.containedby, United States of America
1st Maryland Infantry, Potomac Home Brigade, military.military_unit.place_of_origin, Maryland
m.0wg8pgj, location.partial_containment_relationship.partially_contains, Shenandoah River
Powell River, location.location.partially_contained_by, m.0wjplyf
Virginia, location.location.partiallycontains, m.0wg8p3m
Chain Bridge, transportation.bridge.body_of_water_spanned, Potomac River
Potomac Palisades Site, common.topic.notable_for, g.1yl5l87jq
Potomac River, location.location.contains, Potomac Palisades Site
Pennsylvania, location.location.partially_contains, Youghiogheny River
Mid-Atlantic states, location.location.contains, Potomac River
Maryland, common.topic.image, ChesapeakeTidalWetlands
Clinch River, geography.river.origin, Tazewell County
Maryland, common.topic.webpage, m.0b465gp
Maryland, location.location.partiallycontains, m.0wg9271
Roanoke River, geography.river.origin, Blue Ridge Mountains
Virginia, location.location.partially_contains, New River
North Carolina, location.location.partially_contains, Roanoke River
アメリカ東部 ポトマック川流域の土地利用図、1997年, common.image.appears_in_topic_gallery, Potomac River
Potomac River, geography.body_of_water.bridges, Bloomington Viaduct
Potomac Palisades Site, protected_sites.listed_site.designation_as_natural_or_cultural_site, g.11btv6w_qd
Maryland, location.location.partially_contains, Paint Branch
B & O Railroad Potomac River Crossing, location.location.containedby, Maryland
Maryland, location.location.partiallycontains, m.0wg92gb
Ohio River, location.location.partially_containedby, West Virginia
Maryland, location.location.partially_contains, Pocomoke River
Chester River, location.location.containedby, United States of America
Nottoway River, location.location.partially_containedby, Virginia
Maryland, location.location.adjoin_s, m.02thq3m
Potomac River, geography.body_of_water.bridges, Key Bridge
Maryland, location.statistical_region.religions, m.04406wm
Susquehanna River, location.location.containedby, United States of America
Maryland, location.location.adjoin_s, m.02tjfv1
Potomac River, geography.body_of_water.bridges, Aqueduct Bridge
Shenandoah River, location.location.partially_containedby, Virginia
Maryland, location.location.partially_contains, Christina River
Roanoke River, location.location.partially_containedby, Virginia
Maryland, location.location.partially_contains, Backbone Mountain
B & O Railroad Potomac River Crossing, location.location.containedby, Harpers Ferry
Pocomoke River, location.location.partially_containedby, Virginia
Bluestone River, location.location.partially_contained_by, m.0wg8pfg
Elk River, location.location.containedby, North America
Maryland, location.location.partiallycontains, m.0wkzfkm
Maryland, location.location.partially_contains, Antietam Creek
Maryland, location.location.adjoin_s, m.02tjggz
Pennsylvania, location.location.partially_contains, Susquehanna River
Virginia, location.location.partially_contains, South Branch Potomac River
Youghiogheny River, location.location.containedby, United States of America
Maryland, location.location.partially_contains, Ridge-and-Valley Appalachians
Virginia, location.location.partially_contains, Smith River
Maryland, location.location.partially_contains, Savage Mountain
Dan River, location.location.containedby, North America
Maryland, location.location.partially_contains, Tonoloway Ridge
Delaware, location.location.partially_contains, Choptank River
Christina River, location.location.partially_containedby, Delaware
Christina River, location.location.containedby, United States of America
Maryland, location.statistical_region.religions, m.04404nb
Potomac River, location.location.containedby, United States of America
Maryland, location.location.partiallycontains, m.0wg92b5
Sassafras River, location.location.containedby, United States of America
Virginia, location.location.partiallycontains, m.0x18mj2
Potomac River, geography.river.mouth, Chesapeake Bay
Roanoke River, location.location.containedby, United States of America
Monongahela River, location.location.containedby, North America
Virginia, location.location.partiallycontains, m.0wg8p0k
Virginia, location.location.partiallycontains, m.0wg8p49
Chesapeake and Ohio Canal National Historical Park, base.usnationalparks.us_national_park.state, Maryland
Maryland, location.location.partiallycontains, m.0wg92g5
Clinch River, location.location.partially_containedby, Tennessee
Virginia, location.location.partially_contains, Dan River
Maryland, location.statistical_region.religions, m.044053s
Christina River, location.location.partially_containedby, Maryland
Potomac River, geography.body_of_water.bridges, Woodrow Wilson Bridge
Chester River, geography.river.mouth, Chesapeake Bay
Rock Creek, geography.river.mouth, Potomac River
Mid-Atlantic states, meteorology.cyclone_affected_area.cyclones, 1933 Chesapeake–Potomac hurricane
m.0wg8pbh, location.partial_containment_relationship.partially_contains, Potomac River
Shenandoah River, geography.river.cities, Harpers Ferry
Maryland, common.topic.article, m.04rrq
West Virginia, location.location.partially_contains, Youghiogheny River
ChesapeakeTidalWetlands, common.image.appears_in_topic_gallery, Maryland
Potomac River, location.location.contains, Great Falls
Potomac River, location.location.contains, Construction of Arlington Memorial Bridge
Virginia, location.location.partiallycontains, m.0wg8p39
North Carolina, meteorology.cyclone_affected_area.cyclones, 1933 Chesapeake–Potomac hurricane
Holston River, location.location.partially_containedby, Virginia
West Virginia, location.location.partially_contains, Bluestone River
Youghiogheny River, geography.river.mouth, Monongahela River
Maryland, location.location.events, Eastern Theater of the American Civil War
Elk River, location.location.containedby, United States of America
Potomac Palisades Site, common.topic.notable_types, Location
Potomac Palisades Site, common.topic.article, m.0h3lq7j
Maryland, meteorology.cyclone_affected_area.cyclones, 1933 Chesapeake–Potomac hurricane
Virginia, location.location.partially_contains, Hyco River
Maryland, location.statistical_region.religions, m.04406yn
Maryland, location.statistical_region.religions, m.044054k
Maryland, location.location.partiallycontains, m.0wg92hl
Pocomoke River, location.location.partially_containedby, Maryland
Monocacy River, location.location.partially_containedby, Pennsylvania
m.0b465gp, common.webpage.topic, Maryland
Bluestone River, location.location.partially_contained_by, m.0wg8p15
Maryland, location.location.partiallycontains, m.0wy3dpq
Bluestone River, location.location.containedby, United States of America
Potomac River, geography.body_of_water.bridges, Theodore Roosevelt Bridge
South Branch Potomac River, location.location.containedby, United States of America
Youghiogheny River, location.location.partially_containedby, Pennsylvania
Youghiogheny River, location.location.partially_contained_by, m.0wg8pn3
Potomac River, geography.body_of_water.bridges, Arlington Memorial Bridge
Cheat River, location.location.partially_containedby, West Virginia
Potomac River, location.location.partially_containedby, Washington, D.C.
Fisher River, location.location.partially_containedby, North Carolina
Potomac River, location.location.partially_containedby, Maryland
m.0wp5fxz, location.partial_containment_relationship.partially_contains, North Branch Potomac River
Maryland, location.location.partially_contains, Sideling Hill
Ararat River, location.location.containedby, United States of America
Cheat River, location.location.containedby, North America
Virginia, location.location.partially_contains, Clinch River
B & O Railroad Potomac River Crossing, common.topic.notable_types, Listed Site
Bayard Bridge, transportation.bridge.body_of_water_spanned, Potomac River
Mayo River, location.location.partially_containedby, Virginia
Monocacy River, location.location.containedby, North America
Theodore Roosevelt Bridge, common.topic.image, Op de foto is het Theodore Roosevelt Island  zichtbaar samen met de brug over de Potomac-rivier
Clinch River, location.location.partially_containedby, Virginia
Nottoway River, location.location.partially_containedby, North Carolina
Bluestone River, location.location.containedby, North America
Ararat River, location.location.partially_containedby, Virginia
Potomac River, base.ontologies.ontology_instance.equivalent_instances, m.07nh392
New York, location.location.partially_contains, Susquehanna River
Maryland, location.location.partiallycontains, m.0wg925_
Potomac River, common.topic.notable_types, River
Potomac River, geography.river.cities, Harpers Ferry
m.0wg9d6x, location.partial_containment_relationship.partially_contains, Potomac River
Pocomoke River, location.location.containedby, North America
Washington, D.C., location.location.partially_contains, Potomac River
Maryland, location.location.partially_contains, Allegheny Mountains
Ohio River, location.location.partially_containedby, Pennsylvania
Monocacy River, location.location.containedby, United States of America
Virginia, location.location.partially_contains, Fisher River
3rd Maryland Infantry, Potomac Home Brigade, military.military_unit.place_of_origin, Maryland
Maryland, location.location.events, Battle of Antietam
Powell River, geography.river.mouth, Clinch River
Dan River, location.location.partially_contained_by, m.0wg8p43
m.0gmk943, common.webpage.topic, Maryland
Maryland, location.statistical_region.religions, m.0440597
Delaware, location.location.partially_contains, Nanticoke River
Maryland, location.location.partiallycontains, m.0wg928f
Hyco River, location.location.partially_containedby, Virginia
North Branch Potomac River, common.topic.notable_types, River
Delaware, location.location.partially_contains, Chester River
Virginia, location.location.partially_contains, Mayo River
North Branch Potomac River, geography.river.mouth, Potomac River
Dan River, location.location.partially_containedby, Virginia
Cobb Point Bar Light, location.location.containedby, Potomac River
4th Regiment Potomac Home Brigade Infantry, military.military_unit.place_of_origin, Maryland
Potomac River, location.location.containedby, North America
Maryland, location.location.partiallycontains, m.0wp5fxz
Nottoway River, location.location.partially_contained_by, m.0wg8p0k
Maryland, location.location.containedby, United States, with Territories
Smith River, location.location.containedby, United States of America
Chester River, location.location.partially_containedby, Maryland
Powell River, location.location.containedby, United States of America
Arlington Memorial Bridge, location.location.containedby, Potomac River
Maryland, location.location.partiallycontains, m.0wg92gw
Arlington Memorial Bridge, transportation.bridge.body_of_water_spanned, Potomac River
Maryland, location.statistical_region.religions, m.0440509
Virginia, location.location.partially_contains, Ararat River
Virginia, location.location.partially_contains, Holston River
Dan River, location.location.partially_containedby, North Carolina
Pocomoke River, location.location.containedby, United States of America
West Virginia, location.location.partially_contains, Cheat River
Pocomoke River, location.location.partially_containedby, Delaware
Sassafras River, location.location.partially_containedby, Delaware
Fisher River, location.location.partially_containedby, Virginia
Potomac River, geography.body_of_water.bridges, American Legion Memorial Bridge
South Branch Potomac River, common.topic.notable_types, River
Potomac River, location.location.contains, Arlington Memorial Bridge
Big Sandy River, location.location.containedby, North America
Chester River, location.location.partially_containedby, Delaware
Rivers of the Eastern Shore, book.written_work.subjects, United States of America
Point Lookout Light, location.location.containedby, Potomac River
Maryland, location.location.partiallycontains, m.0wg92j3
Elk River, location.location.partially_containedby, Maryland
Lower Cedar Point Light, location.location.containedby, Potomac River
Virginia, location.location.partially_contains, Potomac River
Clinch River, location.location.containedby, North America
Roanoke River, location.location.partially_contained_by, m.0wg8p49
Maryland, location.location.partiallycontains, m.0wg926j
Potomac River, geography.body_of_water.bridges, Harpers Ferry Bridge
Shenandoah River, location.location.partially_containedby, West Virginia
Maryland, location.location.partially_contains, Wills Mountain
Maryland, location.location.partially_contains, Rock Creek
Maryland, location.location.partiallycontains, m.0wg92ck
Cheat River, location.location.partially_containedby, Pennsylvania
Delaware, location.location.partially_contains, Pocomoke River
Maryland, location.administrative_division.capital, m.0jvw4mx
Maryland, location.location.partiallycontains, m.0wg92d2
Susquehanna River, geography.river.mouth, Chesapeake Bay
Virginia, location.location.partiallycontains, m.0wg8p3g
Potomac River, common.topic.image, アメリカ東部 ポトマック川流域の土地利用図、1997年
New River, location.location.containedby, United States of America
Potomac Palisades Site, location.location.geolocation, m.0z8_hq7
Susquehanna River, location.location.partially_containedby, Pennsylvania
Monocacy River, location.location.partially_containedby, Maryland
m.0wg9271, location.partial_containment_relationship.partially_contains, Susquehanna River
Maryland.png, common.image.appears_in_topic_gallery, Maryland
New River, location.location.partially_containedby, North Carolina
Potomac River, geography.river.origin, Fairfax Stone Historical Monument State Park
Theodore Roosevelt Bridge, transportation.bridge.body_of_water_spanned, Potomac River
Virginia, meteorology.cyclone_affected_area.cyclones, 1933 Chesapeake–Potomac hurricane
North Branch Potomac River, location.location.partially_contained_by, m.0wp5fxz
North Branch Potomac River, location.location.partially_containedby, Maryland
Dan River, location.location.containedby, United States of America
Maryland, location.location.partiallycontains, m.0wg92bw
American Legion Memorial Bridge, transportation.bridge.body_of_water_spanned, Potomac River
Chester River, location.location.partially_contained_by, m.0wkzfkm
Powell River, location.location.partially_containedby, Virginia
West Virginia, location.location.partially_contains, Ohio River
Potomac River, location.location.partially_contained_by, m.0wg8n_9
Maryland, book.book_subject.works, Molly Bannaky
North Branch Potomac River, location.location.partially_contained_by, m.0wp5fyd
1933 Chesapeake–Potomac hurricane, meteorology.tropical_cyclone.affected_areas, Virginia
Maryland, location.location.partially_contains, Monocacy River
Maryland, location.location.partiallycontains, m.0wg92ds
Delaware, location.location.partially_contains, Christina River
Maryland, location.location.events, Battle of North Point
West Virginia, location.location.partially_contains, Big Sandy River
Cheat River, location.location.partially_contained_by, m.0wg8pnn
Maryland, common.topic.webpage, m.04lsv7t
Maryland, location.statistical_region.religions, m.044041f
Maryland, location.location.partially_contains, Youghiogheny River
Mayo River, location.location.partially_containedby, North Carolina
Maryland Point Light, location.location.containedby, Potomac River
Powell River, location.location.containedby, North America
Monongahela River, location.location.containedby, United States of America
Maryland, location.location.partiallycontains, m.0wg92dm
Sassafras River, location.location.partially_contained_by, m.0wg92d2
Virginia, location.location.partiallycontains, m.0wg8p4h
Powell River, geography.river.basin_countries, United States of America
Maryland, location.location.partially_contains, Blue Ridge Mountains
Virginia, location.location.partiallycontains, m.0wg8p6g
West Virginia, location.location.partially_contains, North Branch Potomac River
Virginia, location.location.partially_contains, Nottoway River
1933 Chesapeake–Potomac hurricane, meteorology.tropical_cyclone.affected_areas, North Carolina
Maryland, military.military_unit_place_of_origin.military_units, 4th Regiment Potomac Home Brigade Infantry
Potomac River, geography.body_of_water.bridges, Governor Harry W. Nice Memorial Bridge
Monongahela River, location.location.partially_containedby, Pennsylvania
Maryland, location.location.partiallycontains, m.0wg9288
Upper Cedar Point Light, location.location.containedby, Potomac River
Maryland, base.mystery.cryptid_area_of_occurrence.cryptid_s_found_here, Hyote
Big Sandy River, location.location.containedby, United States of America
Holston River, location.location.containedby, North America
Maryland, location.location.events, 2013 Chesapeake Film Festival
Maryland, common.topic.webpage, m.09ybmk9
Aqueduct Bridge, transportation.bridge.body_of_water_spanned, Potomac River
Potomac River, location.location.contains, Cobb Point Bar Light
Maryland, location.location.partiallycontains, m.0wg92hf
South Branch Potomac River, location.location.partially_containedby, West Virginia
Virginia, location.location.partially_contains, Back Creek
Choptank River, location.location.containedby, North America
Cheat River, location.location.containedby, United States of America
Great Falls, location.location.containedby, Potomac River
m.0wg927r, location.partial_containment_relationship.partially_contains, Potomac River
New River, location.location.partially_containedby, West Virginia
Virginia, location.location.partially_contains, Pocomoke River
Christina River, location.location.partially_containedby, Pennsylvania
Bloomington Viaduct, transportation.bridge.body_of_water_spanned, Potomac River
Maryland Point Light, common.topic.notable_for, g.125cyg3rt
Virginia, location.location.partiallycontains, m.0wg8p6m
Contiguous United States, location.location.contains, Nottoway River
1st Regiment Potomac Home Brigade - Cole's Cavalry, military.military_unit.place_of_origin, Maryland
Virginia, location.location.partially_contains, Roanoke River
Nanticoke River, location.location.containedby, North America
Maryland, location.statistical_region.religions, m.0440695
Chester River, location.location.containedby, North America
Holston River, location.location.partially_contained_by, m.0wg8p5_
Maryland, base.ontologies.ontology_instance.equivalent_instances, m.07nfb73
Susquehanna River, location.location.time_zones, UTC−05:00
Ohio River, location.location.containedby, North America
North Carolina, location.location.partially_contains, New River
West Virginia, location.location.partially_contains, Monongahela River
Mathias Point Light, location.location.containedby, Potomac River
Maryland, location.location.partiallycontains, m.0wg92cd
Roanoke River, location.location.partially_containedby, North Carolina
Potomac River, location.location.partially_contained_by, m.0wg9d6x
Maryland, location.location.partiallycontains, m.0wg927r
Rivers of the Eastern Shore, book.written_work.subjects, Maryland
Maryland, location.statistical_region.religions, m.04403q0
Maryland, location.location.events, 2014 Chesapeake Film Festival
North Carolina, location.location.partially_contains, Nottoway River
Potomac River, location.location.contains, Ragged Point Light
North Branch Potomac River, location.location.partially_containedby, West Virginia
Construction of Arlington Memorial Bridge, location.location.containedby, Potomac River
Holston River, location.location.partially_containedby, Tennessee
Ohio River, location.location.partially_containedby, Kentucky
Potomac River, common.topic.notable_for, g.1259plgx_
B & O Railroad Potomac River Crossing, base.usnris.nris_listing.significance_level, National
Virginia, location.location.partiallycontains, m.0wg8p26
Maryland, location.location.partially_contains, Elk River
Maryland, location.location.partiallycontains, m.0wg9276
New River, location.location.partially_containedby, Virginia
Ragged Point Light, location.location.containedby, Potomac River
Susquehanna River, location.location.partially_contained_by, m.0wg9271
Maryland, location.location.partiallycontains, m.0wg929n
Potomac River, location.location.contains, Upper Cedar Point Light
m.0wp5fyd, location.partial_containment_relationship.partially_contains, North Branch Potomac River
Potomac River, location.location.partially_contained_by, m.0wg927r
New River, location.location.containedby, North America
Governor Harry W. Nice Memorial Bridge, transportation.bridge.body_of_water_spanned, Potomac River
Cheat River, geography.river.mouth, Monongahela River
Bluestone River, location.location.partially_containedby, West Virginia
Maryland, common.topic.notable_for, g.1256bxqnm
Christina River, location.location.containedby, North America
Youghiogheny River, location.location.partially_contained_by, m.0wg92gw
South Branch Potomac River, location.location.partially_containedby, Virginia
Maryland, location.location.events, Gettysburg Campaign
Maryland, location.location.partiallycontains, m.0wg929h
Choptank River, geography.river.mouth, Chesapeake Bay
Maryland, book.book_subject.works, Dark truth
Maryland, location.statistical_region.religions, m.04406nf
Maryland Point Light, location.location.geolocation, m.0ct0d45
Virginia, location.location.events, Gettysburg Campaign
Harpers Ferry, location.location.contains, B & O Railroad Potomac River Crossing
Nanticoke River, location.location.containedby, United States of America
Roanoke River, location.location.containedby, North America
Potomac River, location.location.partially_containedby, West Virginia
West Virginia, location.location.partially_contains, South Branch Potomac River
Maryland, location.location.partially_contains, Susquehanna River
Maryland, location.statistical_region.religions, m.04406vv
Sassafras River, location.location.containedby, North America
Susquehanna River, location.location.containedby, North America
Maryland, location.location.adjoin_s, m.02tjg3j
Maryland, book.book_subject.works, Charm City
Maryland, location.location.partially_contains, Chesapeake and Ohio Canal National Historical Park
Shenandoah River, geography.river.mouth, Potomac River
Maryland, location.location.partially_contains, Great Falls
Maryland, location.location.partiallycontains, m.0wg928z
Ohio River, location.location.partially_containedby, Ohio
Maryland, location.statistical_region.religions, m.04405d1
Maryland, book.book_subject.works, Ten Indians
Maryland, location.location.partially_contains, Sassafras River
Youghiogheny River, location.location.partially_containedby, Maryland
Maryland, location.location.partially_contains, Chesapeake Bay
Youghiogheny River, location.location.partially_containedby, West Virginia
Maryland, symbols.namesake.named_after, Henrietta Maria of France
The Potomac, book.written_work.subjects, Maryland
Maryland, book.book_subject.works, Rivers of the Eastern Shore
1933 Chesapeake–Potomac hurricane, meteorology.tropical_cyclone.affected_areas, Maryland
Maryland, location.location.partiallycontains, m.0wg92fn
m.0wg8p6m, location.partial_containment_relationship.partially_contains, Clinch River
Elk River, location.location.partially_contained_by, m.0wg92j3
Maryland, location.location.geolocation, m.046vx90
Virginia, location.location.partiallycontains, m.0wg8p64
Virginia, location.location.partially_contains, Bluestone River
Hyco River, location.location.partially_containedby, North Carolina
Monocacy River, geography.river.mouth, Potomac River
1933 Chesapeake–Potomac hurricane, meteorology.tropical_cyclone.affected_areas, Mid-Atlantic states
Big Sandy River, location.location.partially_containedby, West Virginia
Maryland, location.location.partially_contains, Conococheague Creek
Fisher River, location.location.partially_contained_by, m.0wg8p07
Potomac River, location.location.partially_containedby, Virginia
Maryland, location.location.partiallycontains, m.0wg92kr
Maryland, location.location.partiallycontains, m.0wg92bb
Potomac River, location.location.partially_contained_by, m.0wg8pbh
Harpers Ferry Bridge, transportation.bridge.body_of_water_spanned, Potomac River
Maryland, location.location.containedby, Contiguous United States
Nottoway River, location.location.containedby, Contiguous United States
Smith River, location.location.partially_containedby, North Carolina
Holston River, location.location.containedby, United States of America
Nanticoke River, location.location.partially_containedby, Delaware
Maryland, location.location.partially_contains, Nanticoke River
Potomac River, location.location.contains, Lower Cedar Point Light
Virginia, location.location.partially_contains, Shenandoah River
Shenandoah River, location.location.partially_contained_by, m.0wg8p1j
Maryland, location.location.partiallycontains, m.0wg92jp
Maryland, book.book_subject.works, Prisoners
Delaware, location.location.partially_contains, Sassafras River
Maryland, common.topic.webpage, m.09xsyxt
Bluestone River, geography.river.mouth, New River
Maryland, book.book_subject.works, Digging to America
Smith River, location.location.partially_containedby, Virginia
Ohio River, location.location.containedby, United States of America
Choptank River, location.location.partially_containedby, Delaware
Potomac River, geography.body_of_water.bridges, Chain Bridge
Choptank River, location.location.containedby, United States of America
Maryland, book.book_subject.works, The Potomac
North Branch Potomac River, location.location.containedby, North America
Maryland, book.book_subject.works, In the dark
New River, location.location.partially_contained_by, m.0wg8pjt
Virginia, location.location.partially_contains, Powell River
Virginia, location.location.partially_contains, Opequon Creek
Maryland, book.book_subject.works, The grand idea
Clinch River, location.location.partially_contained_by, m.0wg8p6m
Maryland, location.statistical_region.religions, m.0440547
Potomac River, location.location.contains, Mathias Point Light
m.0wg8n_9, location.partial_containment_relationship.partially_contains, Potomac River
Maryland, location.location.partiallycontains, m.0wg925t
Virginia, location.location.partiallycontains, m.0wg8p43
Sassafras River, location.location.partially_containedby, Maryland
Chesapeake and Ohio Canal National Historical Park, location.location.partially_containedby, Maryland
North Branch Potomac River, location.location.containedby, United States of America
Maryland, common.topic.webpage, m.0gmk943
Key Bridge, transportation.bridge.body_of_water_spanned, Potomac River
2nd Maryland Infantry, Potomac Home Brigade, military.military_unit.place_of_origin, Maryland
West Virginia, location.location.partially_contains, New River
Sassafras River, geography.river.mouth, Chesapeake Bay
Maryland, location.location.partiallycontains, m.0wp5h_d
Maryland, location.statistical_region.religions, m.04404jl
Potomac River, location.location.contains, Maryland Point Light
Maryland, location.location.adjoin_s, m.0h7y83d
Potomac River, geography.body_of_water.bridges, Bayard Bridge
Nanticoke River, location.location.partially_containedby, Maryland
Potomac River, geography.river.origin, Appalachian Mountains
Bluestone River, location.location.partially_containedby, Virginia

Answer: Chesapeake Bay