Boothbay is a town in Lincoln County, Maine, United States. It includes the villages of East Boothbay and Trevett. The Boothbay region is a center of summer tourist activity, and a significant part of its population does not live there year round. According to the United States Census Bureau, the town has a total area of 46.1 square miles (119 sq.km), of which, 22.1 square miles (57 sq.km) of it is land and 24.0 square miles (62 sq.km) of it (52.09%) is water. Situated on the Cape Newagen peninsula extending into the Gulf of Maine, Boothbay lies between the Sheepscot River and Damariscotta River. The town includes Damariscove Island.