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 Manpo and Lake Bonpo Important Bird Area Lake Manpo and Lake Bonpo Important Bird Area The Lake Manpo and Lake Bonpo Important Bird Area lies within the Rason Special Economic Zone on the coast of north-eastern North Korea, close to its borders with both China and Russia. The 5880 ha site comprises the freshwater lakes, which lie about 3 km apart, and encompasses the 3200 ha Lake Manpo and Lake Bonpo Protected Area. It has been identified by BirdLife International as an Important Bird Area (IBA) because it supports populations of various water- and wetland birds including swan geese, greater white-fronted geese, whooper swans, Oriental storks, white-naped