There are at least 18 named islands in the lake: Stamp Act Island (the largest at 106 acres ), Bass Island, Cate Island, Mink Island, Goose Island, East and West Jockey Cap Islands, Triggs Island, Turtle Island, Fanny Island, Brummet Island, and a group known as the Seven Sisters Islands: Sister Island, Poplar Island, Loon Island, Flo Island, Wal Island, Min Island, and Joe Island.