Trinidad and Tobago is an archipelagic state in the North Atlantic Ocean in the Caribbean. It shares maritime boundaries with Barbados, Guyana, and Venezuela. The geography of Trinidad and Tobago includes mostly plains with some low mountains. The government system is a parliamentary republic; the chief of state is the president, and the head of government is the prime minister. Trinidad and Tobago has a mixed economic system in which there is a variety of private freedom, combined with centralized economic planning and government regulation. Trinidad and Tobago is a member of the Caribbean Community (CARICOM).