Believed to be the world's largest freshwater island, Manitoulin Island is 176 kilometres (110 mi.) long and 5 to 80 kilometres (3 to 50 mi.) wide. More than 100 lakes speckle the interior, including Lake Manitou—thought to be the world's largest lake within a lake. Within that lake are several more islands. Opportunities abound for hiking, bicycling, fishing, camping, boating and scuba diving. Learn More...