The southwest Botswana is covered by Kalahari Desert, to the North is the marshy delta of Okavango River. Despite this being, a wetland Botswana suffers droughts. The original inhabitants of Botswana are the nomadic people known as Kalahari Bushmen. The main languages of this place are English, Tswana, Shona, Khoikhoi and Ndebele. The currency used is Pula. The Tswana people, who make up the majority of the population earn their living mostly by subsistence farming, raising cattle and growing enough maize sorghum and millet. Fresh vegetables are very rare. The diamond reserves have helped to stimulate the economy. The Okavango River is considered haven for wildlife.