Even though very little of Lesotho is covered in water, the rivers that run across the country are an important part of Lesotho's economy. Much of the country's export income comes from water, and much of its power comes from hydroelectricity. The Orange River rises in the Drakensberg mountains in northeastern Lesotho and flows across the entire length of the country before exiting to South Africa at the Mohale's Hoek District in the southwest. The Caledon River marks the northwestern part of the border with South Africa. Other rivers include the Malibamatso, Matsoku and Senqunyane.