The magnificent National Parks of Kenya and Tanzania provide essential refuges for many rare animals. Tourism flows in the cash needed to sustain these conservation efforts. The Lake Victoria is the worlds second largest lake in the terms of surface 26,828 sq miles (69,484 sq km). Around it, the rich volcanic soils support coffee, tea, cotton, sugar cane and vegetables. Lake Tanganyika is 16,400 ft (5,000 m) in depth and lies 8,202 ft (2,500 m) above the sea level. An extinct volcano, Kilimanjaro, is Africas highest mountain 19,340 ft (5,895 m). In the dry regions, camels are common, elsewhere herds of cattle, sheep, and goats. Tsetse Fly limits human settlement and agriculture in much of this region.