Manitoulin Island is located within Lake Huron and is the largest freshwater island in the world. It also contains more than 100 inland lakes, some of which have their own islands within an island. It has the largest lake in a freshwater island and the largest island in a lake on an island in a lake in the world. Essentially Manitoulin Island is a big nesting doll of islands. It is also incredibly scenic and features many outdoor activities and attractions in and around the water.