Tajikistan is a landlocked country in Central Asia. Neighboring countries include Afghanistan, China, Kyrgyzstan, and Uzbekistan. The geography of Tajikistan is dominated by the Pamir-Alay mountains along with valleys in the south and southwest. The government system is a republic; the chief of state is the president, and the head of government is the prime minister. Tajikistan has a mixed economy in which there is a variety of private freedom, combined with centralized economic planning and government regulation.