Mexico is a country located in North America with a North Pacific Ocean, Gulf of Mexico, and Caribbean Sea coastline. Neighboring countries include Belize, United States, and Guatemala. Mexico is crossed by two mountain ranges known as Sierra Madre Oriental and Sierra Madre Occidental, which are the extension of the Rocky Mountains from northern North America. The government system is a federal republic; the chief of state and head of government is the president. Mexico has a free market economy in which the prices of goods and services are determined in a free price system. Mexico is a member of the Asia-Pacific Economic Cooperation (APEC), the North American Free Trade Agreement (NAFTA), and the Trans-Pacific Partnership (TPP).