Question: In which Maine county is Fort Pownall located?

full_context: Document 1: Fort Frederick (Saint John, New Brunswick): Fort Frederick was a British fort at what is now Saint John, New Brunswick, Canada. It was built during the St. John River Campaign of the French and Indian War. It was one of three significant forts which the British built on the major rivers in the Northeast to cut off the natives water way to the ocean (also see Fort Halifax and Fort Pownall).
Document 2: Kittery Point, Maine: Kittery Point is a census-designated place (CDP) in the town of Kittery, York County, Maine, United States. First settled in 1623, Kittery Point traces its history to the first seafarers who colonized the shore of what became Massachusetts Bay Colony and later the State of Maine. Located beside the Atlantic Ocean, it is home to Fort McClary State Historic Site, and Fort Foster Park on Gerrish Island. Cutts Island is home to Seapoint Beach and the Brave Boat Harbor Division of the Rachel Carson National Wildlife Refuge.
Document 3: Fort Mary (Maine): Fort Mary was a British fort built in 1688 that saw action during Queen Anne's War and was located in Saco, Maine overlooking Winter Harbor / Biddeford Pool. The fort replaced Fort Saco (1708), which was built at Saco Falls during King William's War. The commander of the fort during King William's War was Captain John Hill. The fort was attacked in the Northeast Coast Campaign (1703) and natives killed 11 English and took 24 prisoner. Saco was raided again in 1704 and 1705. They overwhelmed the garrison in the fort at Winter Harbor (in present-day Biddeford near Biddeford Pool), forcing them to submit to terms of capitulation. Winter Harbor was raided two more times, in 1707 and 1710.
Document 4: Fort Knox (Maine): Fort Knox, now Fort Knox State Park or Fort Knox State Historic Site, is located on the western bank of the Penobscot River in the town of Prospect, Maine, about 5 mi from the mouth of the river. Built between 1844 and 1869, it was the first fort in Maine built entirely of granite; most previous forts used wood, earth, and stone. It is named after Major General Henry Knox, the first U.S. Secretary of War and Commander of Artillery during the American Revolutionary War, who at the end of his life lived not far away in Thomaston. The fort was designated a National Historic Landmark in 1970, as a virtually intact example of a mid-19th century granite coastal fortification. Fort Knox also serves as the entry site for the observation tower of the Penobscot Narrows Bridge that opened to the public on 19 May 2007.
Document 5: Islesboro, Maine: Islesboro is a town in Waldo County, Maine, United States. The population was 566 at the 2010 census. It has a summer colony accessible by ferry from Lincolnville Beach 3 miles to the west, or by air taxi service. Home to Warren Island State Park, Islesboro includes the villages of Dark Harbor, Pripet and North Islesboro otherwise known as Guinea.
Document 6: Fort Pickering: Fort Pickering is a 17th-century historic fort site on Winter Island in Salem, Massachusetts. Fort Pickering operated as a strategic coastal defense and military barracks for Salem Harbor during a variety of periods, serving as a fortification from the Anglo-Dutch Wars through World War II. Construction of the original fort began in 1643 and it saw use as a military installation into the 20th century. Fort Pickering is a First System fortification named for Colonel Timothy Pickering, adjutant general of the Continental Army and secretary of War in 1795. Today, the remains of the fort are open to the public as part of the Winter Island Maritime Park, operated by the City of Salem.
Document 7: Fort Point State Park: Fort Point State Park is a public recreation area with historic features that overlooks Penobscot Bay from the easternmost tip of Cape Jellison in the town of Stockton Springs, Maine. The state park's 156 acre feature the Fort Point Light and the site of historic Fort Pownall. The park offers hiking trails, picnicking, and fishing.
Document 8: Sullivan, Maine: Sullivan is a town in Hancock County, Maine, United States. The population was 1,236 at the 2010 census. The town was named for Daniel Sullivan, an early settler. Colloquially referred to as "Sully" or "the Sullivans" – like many Maine municipalities composed of villages with geographic designations of the town proper – the municipality was incorporated in 1789. Located in the Upper Schoodic Peninsula sub-region of Maine's Downeast Acadia region, the Municipality has had several incarnations as Waukeag, New Bristol, and later Sullivan; and once included nearby communities of Hancock, Sorrento, and what would later be (parts of Gouldsboro Point TWP, Tunk Lake TWP, the Schoodic Foothills, Hog Bay, and various other districts over time divided off) Township 7, South & Middle Districts. Once home to abundant granite quarries, the Town of Sullivan is now regarded as a residential community for nearby Ellsworth and Mount Desert Island, Maine. Located along US Rte 1, Taunton River, and Hog Bay, Sullivan is home to a slough of reversing tidal falls and many scenic turnouts that dot the Schoodic National Scenic Byway along the Upper Schoodic Peninsula.
Document 9: Fort Pownall: Fort Pownall was a British fortification built during the French and Indian War, whose remains are located at Fort Point State Park in Stockton Springs, Maine. The fort was named for Governor Thomas Pownall, who oversaw its construction. It never saw action, and was destroyed during the American Revolutionary War by the actions of both colonists and the British military to prevent its further use. The fort's remains were listed on the National Register of Historic Places in 1969.
Document 10: Cape Elizabeth, Maine: Cape Elizabeth is a town in Cumberland County, Maine, United States. The town is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. As of the 2010 census, Cape Elizabeth had a population of 9,015.
Document 11: Fort Halifax (Maine): Fort Halifax is a former British colonial outpost on the banks of the Sebasticook River, just above its mouth at the Kennebec River, in Winslow, Maine. Originally built as a wooden palisaded fort in 1754, during the French and Indian War, only a single blockhouse survives. A National Historic Landmark, it is the oldest blockhouse in the United States. It is now set in a municipal park, and is open to the public in the warmer months. It was the first of three significant forts which the British built on the major rivers in the Northeast to cut off the native water ways to the ocean (also see Fort Pownall and Fort Frederick (Saint John, New Brunswick)).
Document 12: Stockton Springs, Maine: Stockton Springs is a town in Waldo County, Maine, United States. The population was 1,591 at the 2010 census. Stockton Springs is home to Fort Point State Park and Fort Point Light, both located on Fort Point, a peninsula on Cape Jellison.
Document 13: Fort Point Light (Maine): The Fort Point Light, or Fort Point Light Station, is located in Fort Point State Park, in Stockton Springs, Maine. A lighthouse at this point has served as an active aid to navigation since 1835; the present lighthouse dates to 1857, and is listed on the National Register of Historic Places.
Document 14: Harpswell, Maine: Harpswell is a town in Cumberland County, Maine, United States, within Casco Bay in the Gulf of Maine. The population was 4,740 at the 2010 census. Harpswell is composed of land contiguous with the rest of Cumberland County, called Harpswell Neck, as well as three large islands connected by bridges: Sebascodegan Island (locally known as Great Island), Orr's Island, and Bailey Island and over 200 smaller islands. Harpswell is part of the Portland–South Portland–Biddeford, Maine Metropolitan Statistical Area.
Document 15: Fort Putnam: Fort Putnam was a military garrison during the Revolutionary War at West Point, New York, United States. Built by a regiment of Colonel Rufus Putnam's 5th Massachusetts Regiment, it was completed in 1778 with the purpose of supporting Fort Clinton, which sat on the edge of the Hudson River about a 3/4 of a mile away. The fort was rebuilt and enlarged in 1794 before falling into disuse and disrepair as the military garrison at West Point became obsolete in the early mid-19th century. It underwent a major preservation as a historical site in 1909, and has been continually in the process of preservation since. Sitting at an altitude of 500 feet above sea level, it was West Point's largest garrison during the Revolutionary War. The Fort is under the supervision of the West Point Museum Director, David M. Reel and is operated by the United States Army Garrison, West Point. Access to the Fort is seasonal and as summer staff are available.
ground_truth: Waldo County, Maine