|Primary inflows||Ruhuhu River|
|Primary outflows||Shire River, in turn into Zambesi River|
|Basin countries||Malawi, Mozambique, Tanzania|
|Max. length||560 km to 580|
|Max. width||75 km|
|Surface area||29,600 km2|
|Average depth||292 m|
|Max. depth||706 m|
|Water volume||8,400 km³|
|Surface elevation||500 meters above sea level|
|Islands||Likoma and Chizumulu islets|
Lake Malawi (Lake Nyasa, or Lago Niassa in Mozambique) is the third largest and second deepest lake in Africa, it is also the ninth largest in the world.
It is reportedly the habitat of more species of fish than any other body of freshwater, including more than 1000 species of cichlids, and was officially declared a reserve by the Government of Mozambique on June 10, 2011.
The lake lies in a valley formed by the opening of the East African Rift, where the African tectonic plate is being split into two pieces. This is called a divergent plate tectonics boundary. It is variously estimated at about 40,000 years old or about one to two million years. The lake is about 350 kilometres southeast of Lake Tanganyika.