Ontario's Manitoulin Island is the world's largest freshwater lake island. It is also Canada's 31st largest island. Manitoulin Island itself has 108 freshwater lakes.
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The largest island in a lake is Manitoulin Island in Lake Huron, Canada – 2,766 km2 (1,068 sq mi). The largest island in a lake on an island is Samosir (a peninsula that is technically surrounded by water only because a narrow canal was built across it) in Danau Toba on Sumatra – 630 km2 (240 sq mi).
Borneo Island is the 3rd largest Island, and the only Island in the world comprises of three countries. The large part of this Island is with Indonesia, and the remaining part is with Brunei and Malaysia.