Lake Tanganyika is home to some of the most unique types of cichlids found around the globe, and includes some of the most expensive freshwater fish. Lake Tanganyika is one of the two great rift lakes in Eastern Africa, with the other being Lake Malawi. These two great rift lakes formed millions of years ago. A result of tectonic plates shifting, creating a long tear in the earth's crust, which then filled with water. Along with these two great rift lakes a number of smaller lakes and ponds also formed.