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
Maltby Lake Maltby Lake Maltby Lake is located on southern Vancouver Island, British Columbia. It is located 10 km north of Victoria, British Columbia in the Tod Creek Watershed. The lake is the headwaters for the watershed, which eventually feeds the world class Butchart Gardens. Maltby Lake is a pristine freshwater source in the middle of a semi rural developing area on the Saanich Peninsula on Vancouver Island. The lake and the surrounding area of pristine land hosts an abundance of wildlife, exotic aquatic life (including freshwater jellyfish) and one of the largest Douglas fir trees in the Greater Victoria area. For