<Li> Lake Nipissing, connected to Georgian Bay by the French River, contains two volcanic pipes, which are the Manitou Islands and Callander Bay . These pipes were formed by a violent, supersonic eruption of deep - origin . The lake lies in the Ottawa - Bonnechere Graben, a Mesozoic rift valley that formed 175 million years ago . </Li> <Li> Lake Simcoe, connected to Georgian Bay by the Severn River, serves as part of the Trent--Severn Waterway, a canal route traversing Southern Ontario between Lakes Ontario and Huron . </Li> <Li> Lake St. Clair, connected with Lake Huron to its north by the St. Clair River and with Lake Erie to its south by the Detroit River . Although it is 17 times smaller in area than Lake Ontario and only rarely included in the listings of the Great Lakes, proposals for its official recognition as a Great Lake are occasionally made, which would affect its inclusion in scientific research projects, etc., designated as related to "The Great Lakes". </Li> <P> Dispersed throughout the Great Lakes are approximately 35,000 islands . The largest among them is Manitoulin Island in Lake Huron, the largest island in any inland body of water in the world . The second - largest island is Isle Royale in Lake Superior . Both of these islands are large enough to contain multiple lakes themselves--for instance, Manitoulin Island's Lake Manitou is the world's largest lake located on a freshwater island . Some of these lakes even have their own islands, like Treasure Island in Lake Mindemoya in Manitoulin Island </P>

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