Tajikistan's official language is Tajik, though Russian is commonly used in business. It has a presidential republic political system where the president is head of state and government. Sunni Islam is the official religion, though Tajikistan considers itself secular. Tajikistan is a landlocked, mountainous country located in Central Asia. The main sources of income are aluminum production, cotton growing, and remittances from migrant workers as Tajikistan has a largely agrarian economy.