Lake Volta (located at 6°30′N 0°0′E) is the largest reservoir by surface area in the world, and the fourth largest one by water volume. It is located completely within the country of Ghana, and it has a surface area of about 8,502 km² (3,275 square miles). Lake Volta lies along the Greenwich Meridian, and just six degrees of latitude north of the Equator. The lake's northmost point is close to the town of Yapei, and its southmost extreme is at the Akosombo Dam, 520 kilometres downstream from Yapei.