Lake Superior other Great Lakes fish, populations have also been affected by the accidental or intentional introduction of foreign species such as the sea lamprey and Eurasian ruffe. Accidental introductions have occurred in part by the removal of natural barriers to navigation between the Great Lakes. Overfishing has also been a factor in the decline of fish populations. Lake Superior Lake Superior (; ), the largest of the Great Lakes of North America, is also the world's largest freshwater lake by surface area, and the third largest freshwater lake by volume. The lake is shared by the Canadian province of Ontario to
Lake Mindemoya Lake Mindemoya Lake Mindemoya is a lake of Ontario, Canada. It is located within Manitoulin Island, which is the world's largest island in a freshwater lake (Lake Huron). Mindemoya Lake is located near the town of Mindemoya on Manitoulin Island, co-ordinates Lat. 45° 45' 41" Long. 82° 12' 07". The lake is the third largest on Manitoulin Island. It has a perimeter of 33.5 km (20.8 miles), its marl clay base imparting to a deep blue to light green colour. The lake reaches depths of 21 m (69'), while the average depth is 7.3 m (24'); the surface area is