Pleasant Bay is a bay

Bay

A bay is an area of water mostly surrounded by land. Bays generally have calmer waters than the surrounding sea, due to the surrounding land blocking some waves and often reducing winds. Bays also exist as an inlet in a lake or pond. A large bay may be called a gulf, a sea, a sound, or a bight...

 in Washington County

Washington County, Maine

Washington County is a county located in the U.S. state of Maine. In 2010, its population was 32,856. Its county seat is Machias.Sometimes referred to as "Sunrise County" because it is the easternmost county in the United States, and it is often where the rising sun first shines on the 48...

, Maine

Maine

Maine is a state in the New England region of the northeastern United States, bordered by the Atlantic Ocean to the east and south, New Hampshire to the west, and the Canadian provinces of Quebec to the northwest and New Brunswick to the northeast. Maine is both the northernmost and easternmost...

 at the mouth of the Pleasant River

Pleasant River (Pleasant Bay)

The Pleasant River is a river in Washington County, Maine. From the outflow of Pleasant River Lake in Beddington, the river runs south, east, and south to Pleasant Bay. The river's mouth is on the border between the towns of Harrington and Addison....

.

Located between the towns of Addison

Addison, Maine

Addison is a town in Washington County, Maine, United States. The town was named after English author Joseph Addison. The population was 1,209 according to the 2000 census.-Geography:...

 and Harrington

Harrington, Maine

Harrington is a town in Washington County, Maine, United States. The population was 882 at the 2000 census. Harrington is an old seafaring and shipbuilding village.-History:...

, on the east it is bordered by Cape Spit and on the west it is separated from Harrington Bay

Harrington Bay

Harrington Bay is a bay in Washington County, Maine.Located between the towns of Harrington and Milbridge, it is separated from Pleasant Bay on the east by Ripley Neck, and from Narraguagus Bay on the west and south by Fastet Island and Dyer Island....

 by Ripley Neck, and from Narraguagus Bay

Narraguagus Bay

Narraguagus Bay is a bay in Washington County, Maine.Located at the mouth of the Narraguagus River between the towns of Harrington and Milbridge, it is separated from Harrington Bay to the northeast by Fastet Island and Pleasant Bay to the east by Dyer Island.The bay extends roughly 4.5 mi. ...

 by Dyer Island.
The bay extends roughly 6 mi. (10 km) and is 2.5 mi. (4 km) at its widest. The Nash Island Light

Nash Island Light

Nash Island Light is a lighthouse on Nash Island at the entrance to Pleasant Bay in Maine.-History:It was first established in 1838. The present structure was built in 1874. It was replaced by a buoy in 1982...

is located on Nash Island at the entrance to the bay.