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
Begnas Lake is used for irrigation and some parts of the lake are used as caged fisheries. The Begnas lake area has a number of swampy areas around it, many of which have been converted to paddy fields day by day. Begnas Lake Begnas Lake is a freshwater lake in Pokhara Lekhnath Metropolis of Kaski district of Nepal located in the south-east of the Pokhara Valley. The lake is the third largest lake of Nepal and second largest, after Phewa lake, among the eight lakes in Pokhara Valley. Water level in the lake fluctuates seasonally due to rain, and utilization for irrigation.