Total area: 3,515 sq mi (9,104 sq km)
Population (2006 est.): 3,927,188
Capital and largest city (2002 est.): San Juan - 433,412
Other large cities: Bayamón - 224,670; Ponce - 186,112; Carolina - 187,468
Currency: U.S. dollar
Languages: Spanish and English (both official)
Religions: Roman Catholic 85%, Protestant and other 15%
Time zone: GMT-4, DST is not observed
Electricity: AC 120/60Hz, standard American plugs are used
Puerto Rico, officially the Commonwealth of Puerto Rico, is a self-governing territory of the United States located in the northeastern Caribbean, to the east of the Dominican Republic and west of the U.S. Virgin Islands. It consists of the island of Puerto Rico and a number of smaller islands, with the largest of them being Vieques, Culebra, and Mona. Puerto Rico is the smallest and the most eastern island of the Greater Antilles.
Over 60% of the territory is mountainous (the interior of the island), with the highest point Cerro de Punta, 1,338 m (4,389 ft). Other Puerto Rican landscapes include rain forests, yellow sand beaches, deserts and caves (the island has the third largest subterranean river system in the world).
