Manitoulin Island in Lake Huron, Canada – 2,766 km2 (1,068 sq mi)[2] René-Levasseur Island in the Manicouagan Reservoir, Quebec, Canada – 2,000 km2 (770 sq mi).[2] It became an artificial island when the Manicouagan Reservoir was flooded in 1970, merging Mouchalagane Lake on the western side and Manicouagan Lake on the eastern side. Olkhon in Lake Baikal, Russia – 730 km2 (280 sq mi)[2] Isle Royale in Lake Superior, United States – 541 km2 (209 sq mi)[2] Ukerewe Island in Lake Victoria, Tanzania – 530 km2 (200 sq mi)[2] St. Joseph Island in Lake Huron, Canada – 365 km2 (141 sq mi)[2] Drummond Island in Lake Huron, United States – 347 km2 (134 sq mi)[2] Idjwi in Lake Kivu, Democratic Republic of the Congo – 285 km2 (110 sq mi)[2] Ometepe Island in Lake Nicaragua, Nicaragua – 276 km2 (107 sq mi)[3] Bugala Island in Lake Victoria, Uganda – 275 km2 (106 sq mi)[3] St Ignace Island in Lake Superior, Canada – 274 km2 (106 sq mi)[3]