Sebago Lake State Park is a public recreation area encompassing 1,342 acres (543 ha) on the north shore of Sebago Lake in the towns of Naples and Casco, Cumberland County, Maine. It opened in 1938 as one of Maine's original five state parks. The mostly forested park is divided into east and west sections by the Songo River. It is managed by the Maine Department of Agriculture, Conservation and Forestry.