The Athi-Galana-Sabaki River is the second longest river in Kenya (after the Tana River). It has a total length of 390 kilometres (240 mi), and drains an area of 70,000 square kilometres (27,000 sq mi).[citation needed] The river rises in the Gatamaiyo Forest as the Athi River and enters the Indian Ocean as the Galana River (also known as the Sabaki River).