4. Lake Huron
The second-largest of the Great Lakes, Huron covers more than 23,000 square miles and is 247 miles across at its widest point. Most of the lake likes in Canada, and that part is the largest bit of water in the nation. Huron gets most of its water from the St. Mary's River, flowing in from Lake Superior, and a little run-over from Lake Michigan through the Straits of Mackinac.
Manitoulin Island is the largest freshwater island in the world, lying in the northern part of Huron in Ontario. It has more than 100 lakes of its own. Somewhere around 13,000 people live on Manitoulin year-round.