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 Volta Lake Volta Lake Volta is the largest reservoir, man-made lake, in terms of surface area contained behind the Akosombo Dam. It is completely within the country of Ghana and has a surface area of . Stretching from Akosombo in the south to the northern part of the country, it is one of the largest man-made reservoirs in the world. Lake Volta lies along the Greenwich meridian, and just six degrees of latitude north of the Equator. The lake's northernmost point is close to the town of Yapei, and its southernmost extreme is at the Akosombo Dam, downstream from Yapei. Akosombo