Laguna de Bay, an inland body of water covering 900 square kilometers, is the country's largest lake. Located between the provinces of Rizal and Laguna, the lake receives its water from 21 river systems. In the middle of the lake lies the island of Talim, a heavily populated settlement of mostly fishermen. The second largest lake in the country is Lake Sultan-Alonto in Mindanao. Commonly known as Lake Lanao, the lake covers an area of 355 square kilometers. Meanwhile, the world's largest inland body of water is the Caspian Sea, which is actually a lake in the boundary of Europe and Asia and covering an area of 143,240 square miles. Lake Superior (North America), Lake Victoria (Africa), the Aral Sea (Russia) and Lake Huron (North America) are also among the world's largest lakes.