Lake Malawi also known as Lake Nyasa, is an African Great Lake, located between Malawi, Mozambique and Tanzania. It is the southernmost lake in the East African Rift system. Lake Malawi is the ninth largest lake in the world and the third largest lake in Africa.Lake Malawi is a meromictic lake (water layers do not mix). The lake has three layers, with different densities due to variations in temperature at each depth. It has about 1,500 kilometers (930 miles) of shoreline.