Big Simpson Island in Great Slave Lake, Canada – 251 km2 (97 sq mi)[1] Blanchet Island in Great Slave Lake, Canada – 240 km2 (93 sq mi)[3] Rubondo Island in Lake Victoria, Tanzania – 237 km2 (92 sq mi)[3] Buvuma Island in Lake Victoria, Uganda – 230 km2 (89 sq mi)[3] The largest island in Sobradinho Reservoir, Brazil – 200 km2 (77 sq mi)[3] Glover Island in Grand Lake, Canada – 191 km2 (74 sq mi)[3] Michipicoten Island in Lake Superior, Canada – 181 km2 (70 sq mi)[3] Preble Island in Great Slave Lake, Canada – 179 km2 (69 sq mi)[3] Cockburn Island in Lake Huron, Canada – 175 km2 (68 sq mi) Hurissalo in Lietvesi, Finland – 174 km2 (67 sq mi)[5] Partalansaari in Haapaselkä, Finland – 170 km2 (66 sq mi)[5] Teresa Island in Atlin Lake, Canada - 159.35 km2 (61.53 sq mi) Hecla Island in Lake Winnipeg, Canada – 151 km2 (58 sq mi) Beaver Island in Lake Michigan, United States – 144 km2 (56 sq mi) Sugar Island in Lake Nicolet – Lake George, United States – 130 km2 (50 sq mi) Wolfe Island in Lake Ontario, Canada – 124 km2 (48 sq mi) Viljakansaari in Haapaselkä, Finland – 115 km2 (44 sq mi) Antelope Island in the Great Salt Lake, United States – 110 km2 (42 sq mi) Black Island in Lake Winnipeg, Canada – 105 km2 (41 sq mi) Selaön in Mälaren, Sweden – 91 km2 (35 sq mi) Bois Blanc Island in Lake Huron, United States – 88 km2 (34 sq mi) Grand Isle in Lake Champlain, United States – 81.9 km2 (31.6 sq mi) Ukara Island in Lake Victoria, Tanzania – 81 km2 (31 sq mi)