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 outflow of the lake is the Ugarinka River which flows to the west and crosses a narrow, several hundred meters wide, stretch of land separating Lake Sebezhskoye and Lake Orono, another big lake in the area. Both lakes belong to the drainage basin of the Daugava. 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