Question: Name the harbor where Squirrel Island in Lincoln Conty Maine is located?

Context paragraphs:
Black Rock Harbor: Black Rock Harbor is located in Bridgeport, Connecticut on Long Island Sound.  The Black Rock Harbor Light on Fayerweather Island marks the entrance to the harbor on its east, while St. Mary's by the Sea forms its western beachhead.  Seaside Park runs along the northeastern part of the harbor.  The harbor is the mouth of Cedar Creek.  It is a protected harbor that developed as a trade port and shipbuilding center in the 18th century.  It is now primarily a recreational harbor, having been superseded by the Bridgeport Harbor, which was enlarged by substantial breakwaters in 1907.

Southport, Maine: Southport is a town in Lincoln County, Maine, United States.  The population was 606 at the 2010 census.  It includes the villages of Southport, West Southport, Cape Newagen, and Squirrel Island.  The majority of the town's residents live on its main island, Southport Island.

Winter Harbor Light: Winter Harbor Light is a lighthouse in Winter Harbor, Maine.  It is located on Mark Island, a small island between the Schoodic Peninsula and Turtle Island, near the entry to the town's main harbor.  The light was built in 1856 and was deactivated in 1933; it is no longer an aid to navigation, and is privately owned.  The light was listed on the National Register of Historic Places as Winter Harbor Light Station on February 1, 1988.

Great Wass Island: Great Wass Island (approx. 1700 acres) lies in the Atlantic Ocean off the coast of the State of Maine, United States.  On the mainland is Jonesport in Washington County.  The island is 5 mi (8 km) long, 1.5 mi (2.5 km) wide and it is the biggest island in the Great Wass Archipelago, which contains over 43 islands extending off the coast from Jonesport.  Great Wass Island is connected with a bridge to Beals Island, which is then connected to the mainland.  Head Harbor Island and Steels Harbor Island lie close to the east.  The 1450 acre Great Wass Island Preserve is in the island.  The interior of Great Wass Island supports coastal Maine's largest stand of jack pine, other typical plants are bakeapple ("Rubus chamaemorus"), deer-hair sedge ("Trichophorum cespitosum"), and dragon’s mouth orchid ("Arethusa bulbosa").  The island is part of the Town of Beals, in Washington County.

Monhegan, Maine: Monhegan is a plantation in Lincoln County, Maine, United States, about 12 nmi off the mainland.  The population was 69 at the 2010 census.  The plantation comprises its namesake island and the uninhabited neighboring island of Manana.  The island is accessible by scheduled boat service from Boothbay Harbor, New Harbor and Port Clyde.  It was designated a National Natural Landmark for its coastal and island flora in 1966.

West Boothbay Harbor, Maine: West Boothbay Harbor is an unincorporated village in the town of Boothbay Harbor, Lincoln County, Maine, United States.  The community is located along Maine State Route 27 10.7 mi south of Wiscasset.  West Boothbay Harbor has a post office with ZIP code 04575.

Belichy Island: Belichy Island (Russian: Остров Беличий , "Ostrov Belichy", literally: 'Squirrel Island') is a narrow island in the northwestern Sea of Okhotsk, one of the Shantar Islands.

Squirrel Island, Maine: Squirrel Island, Maine is a summer resort colony off the coast of Boothbay Harbor.  The origin of the name is not related to its squirrel population, since according to island chronicler Charles McLane "[s]quirrels do not inhabit the island (or if they do now, they did not in early times according to local pundits)," but, rather, refers to the shape of the island which, when seen from above, resembles a squirrel holding an acorn.

Jill Goldthwait: Jill Goldthwait is an American politician from Maine.  Goldthwait grew up in New Jersey and obtained a degree in nursing in California.  She served a stint as a Peace Corps volunteer in Tonga.  She moved to Maine in 1978 and settled in Bar Harbor, Maine on Mount Desert Island.  She worked as an emergency room nurse at Mount Desert Island Hospital and served on the Bar Harbor Town Council for 9 years prior to running for Maine State Senate.  An unenrolled (independent), she won 4 terms (1994-2002) in the State Senate before being unable to run for re-election due to term-limits.  She then took a job with Jackson Laboratory in Bar Harbor, which later turned into a permanent position as Director of Government Relations.  In 2005, Goldthwait was named by Governor John Baldacci to the state's newly created Creative Economy Council.

Roche Harbor, Washington: Roche Harbor is a sheltered harbor on the northwest side of San Juan Island in San Juan County, Washington, United States, and the site of a resort of the same name.  Roche Harbor faces Haro Strait and the Canada–United States border.  The harbor itself provides one of the better protected anchorages in the islands.  The harbor is surrounded on the east side by San Juan Island, on the north side by Pearl Island, and on the west and south sides by Henry Island.  Most of the harbor is 35 to 45 feet (11 to 14 meters) deep.  Roche Harbor has a small airport used primarily by local residents.

Supporting paragraphs: Southport, Maine Squirrel Island, Maine
Answer: Boothbay Harbor