The Zambezi (also spelled Zambesi) is the fourth-longest river in Africa, and the largest flowing into the Indian Ocean. The area of its basin is 1,570,000 km² (606,000 miles²), slightly less than half that of the Nile. The 2,574 km (1,600 mile) long river has its source in Zambia and flows through Angola, along the border of Namibia, Botswana, Zambia and Zimbabwe, to Mozambique, where it empties into the Indian Ocean.