Question: The Little River is a 7.2 mile long (11.6 km) river largely in the town of Exeter in Rockingham County, New Hampshire, it is a tributary of the Exeter River, part of the Great Bay/Piscataqua River watershed in which New Hampshire region, the southeast area of the U.S. state of New Hampshire that includes the eastern portion of Rockingham County and the southern portion of Strafford County?

Context paragraphs:
Oyster River (New Hampshire): The Oyster River is a 17 mi river in Strafford County, southeastern New Hampshire, United States.  It rises in Barrington, flows southeast to Lee, then east-southeast in a serpentine course past Durham to meet the entrance of Great Bay into Little Bay.  The bays are tidal inlets of the Atlantic Ocean, to which they are connected by a tidal estuary, the Piscataqua River.  The freshwater portion of the river is 14.1 mi long, and the tidal river extends 2.9 mi from Durham to Great Bay.

Seacoast Region (New Hampshire): The Seacoast Region is the southeast area of the U.S. state of New Hampshire that includes the eastern portion of Rockingham County and the southern portion of Strafford County.  The region stretches 13 mi along the Atlantic Ocean from New Hampshire's border with Salisbury, Massachusetts to the Piscataqua River and New Hampshire's border with Kittery, Maine.  The shoreline is generally very rocky and rough in nature, although a few sandy beaches have been created using jetties/groins, particularly in the towns of Rye and Hampton.  The Seacoast Region stretches as far west as Epping.  Portsmouth, the largest municipality and only city in Rockingham County, serves as the cultural and commercial hub of the region.  Portsmouth has numerous historical landmarks and tourist attractions including Strawberry Banke, the Moffatt-Ladd House, the John Paul Jones House, and the Portsmouth Children's Museum, which moved to Dover in 2010.  The Seacoast Region was the first area of the state to be permanently settled by Europeans in the early 17th century.

Mendum's Pond: Mendums Pond is a 253 acre water body located primarily in Strafford County in eastern New Hampshire, United States, in the town of Barrington.  Its extreme southern end dips into the town of Nottingham in Rockingham County.  The pond is located on the Little River, a tributary of the Lamprey River and part of the larger Piscataqua River watershed.

Little River (Lamprey River): The Little River is a 10.4 mile long (16.7 km) river located in southeastern New Hampshire in the United States.  It is a tributary of the Lamprey River, part of the Great Bay and Piscataqua River watershed leading to the Atlantic Ocean.

Squamscott River: The Squamscott River is a 6 mi tidal river in Rockingham County, southeastern New Hampshire, in the United States.  It rises at Exeter, fed by the Exeter River.  The Squamscott runs north between Newfields and Stratham to Great Bay, a tidal estuary, which is connected to the Piscataqua River, a tidal inlet of the Atlantic Ocean.

Little River (Brentwood, New Hampshire): The Little River is a 7.3 mile long (11.7 km) river in the towns of Kingston and Brentwood in Rockingham County, New Hampshire, in the United States.  It is a tributary of the Exeter River, part of the Great Bay/Piscataqua River watershed in the New Hampshire Seacoast region.  The river should not be confused with the Little River of Exeter, New Hampshire, another tributary of the Exeter River less than three miles away.

Little River (Exeter, New Hampshire): The Little River is a 7.2 mile long (11.6 km) river largely in the town of Exeter in Rockingham County, New Hampshire, in the United States.  It is a tributary of the Exeter River, part of the Great Bay/Piscataqua River watershed in the New Hampshire Seacoast region.  The river should not be confused with the Little River of Brentwood and Kingston, another Exeter River tributary less than three miles to the west.

Great Bay (New Hampshire): Great Bay is a tidal estuary located in Strafford and Rockingham counties in eastern New Hampshire, United States.  The bay occupies over 6000 acre , not including its several tidal river tributaries.  Its outlet is at Hilton Point in Dover, New Hampshire, where waters from the bay flow into the Piscataqua River, thence proceeding southeast to the Atlantic Ocean near Portsmouth.  The northern end of the bay, near its outlet, is referred to as Little Bay.

Bellamy Reservoir: Bellamy Reservoir is a 333 acre impoundment located in Strafford County in eastern New Hampshire, United States, in the town of Madbury.  An eastern arm of the lake extends a short distance into Dover.  The reservoir serves as the primary water supply for the city of Portsmouth, New Hampshire.  Its outlet is the Bellamy River, a tributary of Great Bay, a tidal estuary connected to the Atlantic Ocean by the Piscataqua River.

Newington, New Hampshire: Newington is a town in Rockingham County, New Hampshire, United States.  The population was 753 at the 2010 census.  It is bounded to the west by Great Bay, northwest by Little Bay and northeast by the Piscataqua River.  It is home to Portsmouth International Airport at Pease (formerly Pease Air Force Base), and to the New Hampshire National Guard.  The 110 acre Old Town Center Historic District is listed on the National Register of Historic Places.

Supporting paragraphs: Little River (Exeter, New Hampshire) Seacoast Region (New Hampshire)
Answer: Seacoast Region