Colombia, officially Republic of Colombia, Spanish República de Colombia, country of northwestern South America. Its 1,000 miles (1,600 km) of coast to the north are bathed by the waters of the Caribbean Sea, and its 800 miles (1,300 km) of coast to the west are washed by the Pacific Ocean. The country is bordered by Panama, which divides the two bodies of water, on the northwest, by Venezuela and Brazil on the east, and by Peru and Ecuador on the south. It is more than twice the size of France and includes the San Andrés y Providencia archipelago, located off the Nicaraguan coast in the Caribbean, some 400 miles (650 km) northwest of the Colombian mainland. The population is largely concentrated in the mountainous interior, where Bogotá, the national capital, is situated on a high plateau in the northern Andes Mountains.