Puerto Rico (full name, Commonwealth of Puerto Rico) is a self-governing part of the USA. An island between the Caribbean Sea and the North Atlantic Ocean, east of the Dominican Republic, Puerto Rico covers an area of approximately 9,000 sq km and has 501 km of coastline. Puerto Rico’s terrain mostly consists of mountains and a coastal plain in the north with mountains on the west coast and sandy beaches along most coastal areas. San Juan is the capital, with a time difference of 4 hours behind that of GMT. The currency is the US dollar, and exports include chemicals, foodstuffs and machinery. The population of approximately 4,000,000 people comprises an ethnic makeup that is 76.2% white (mostly of Spanish origin). The primary languages are Spanish and English, and the predominant religion is Christianity.