Sebago Lake is the deepest lake in the U.S. state of Maine. The lake is about 316 feet deep. It is connected to Brandy Pond via the Songo River, and from Brandy Pond to Long Lake in Naples, Maine. The name of Sebago Lake is the making of a Native American Tribe in Maine. The name was later adopted by a local footwear manufacturer. Six towns touch the lake, and its 47 square miles provide the water supply for the city of Portland. Sebago Lake, according to the "Friends", "once possessed prior to 1987 the finest natural inland beaches in the world for a lake of its size and recreational quality".