Botswana is a landlocked country in Southern Africa that borders the countries of Namibia, South Africa, Zimbabwe and Zambia. The geography is flat and up to 70% of Botswana is covered by the Kalahari Desert thus making it a sparsely populated country with little agricultural activity. The government system is a parliamentary republic; the chief of state and head of government is the President. Botswana has a mixed economic system in which the economy includes a variety of private freedom, combined with centralized economic planning and government regulation. Botswana is a member of the African Union (AU) and the African Economic Community (AEC).