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 Sebezhskoye Lake Sebezhskoye Sebezhskoye or Sebezh (Себежское) is a freshwater lake in the southwest of Pskov Oblast in Russia, close to the borders with Latvia and Belarus. It has a surface area of . The lake takes its name from Sebezh, a town sitting on a low-lying promontory jutting out into the lake. The lake surface lies above sea level. Its maximum depth is . In 1996, the lake basin with a cluster of similar lakes was designated the Sebezhsky National Park. The biggest tributary of the lake is the Cherneya River, which drains into Lake Sebezhskoye from the east. The