Chad is a landlocked country in Central Africa. Neighboring countries include Libya, Sudan, Central African Republic, Cameroon, Nigeria, and Niger. The geography is broad with arid plains and desert in the north and mountains in the northwest. The government system is a republic. The chief of state is the president, and the head of government is the prime minister. Chad has a mixed economic system in which much of the population relies on subsistence farming and livestock, but private sector development depends on foreign capital. Chad is a member of the Economic Community of Central African States (ECCAS).