The Narramissic River is a 16.8-mile-long river in southwestern Maine. It flows from Sebago Lake to the Saco River in the town of Buxton. The river is part of the Presumpscot River watershed, which drains into Casco Bay. The Narramissic River has several tributaries, including the Little River, the West Branch Narramissic River, and the East Branch Narramissic River. The river is popular for fishing, canoeing, and kayaking. The river also supports a variety of wildlife, such as beavers, otters, herons, and bald eagles.