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 Elbert Lake Elbert Lake Elbert is a circular lake with a circular cove on its southwest side. The Polk County Water Atlas says it is sometimes known as Little Elbert, but no other sources have used this name. Lake Elbert is a natural freshwater lake with a surface area. It has ten to twelve mostly very small islands, all near shore. The largest, on the south side, is about long and about wide. It is entirely surrounded by Lake Elbert Drive. On the south side of the lake, Lake Elbert Drive is a major thoroughfare linking up on the southwest with