At , Flevopolder, in the now-freshwater lake IJsselmeer, is the largest man-made island in the world. There are few naturally occurring lake islands with an area in excess of . Of these, five are located in the large Great Lakes of North America, three are located in the large African Great Lakes, one is located in the largest lake in Central America, one was formed by the world's fourth largest meteorite impact, and one is located in the largest (by volume) lake in the world.