Great Lakes Maps
The Great Lakes constitute one of the largest freshwater systems on earth, containing 18% of the world's surface freshwater. Only the polar ice caps and Lake Baikal in Siberia contain more freshwater than the Great Lakes! Spanning more than 1,200 kilometres (745 miles) from west to east, the Lakes provide water for consumption, transportation, power and recreation and play a major role in the ecology, climate culture and economy of North America.
Learn more about these vast inland freshwater seas, including their drainage basins and Areas of Concern, by exploring a selection of Great Lakes-related maps developed by Environment Canada's GIS Unit in Ontario Region.
Be sure to check back often as new maps will be posted regularly!
Click to view larger image (64 kb.)
Areas of Concern in the Great Lakes - St. Lawrence River Basin (54 kb)
Lake Superior Drainage Basin, showing RAP Sites (65 kb)
Lake Erie Drainage Basin (56 kb)
Selected areas on the Niagara Peninsula that are Susceptible to Groundwater Contamination (61 kb)
Canadian Carolinian Zone (50 kb)