Venezuela, officially the Bolivarian Republic of Venezuela, is a federal republic on the northern coast of South America, consisting of a continental land and a large number of small islands and islets in the Caribbean Sea, whose capital and largest urban agglomeration is the city of Caracas. It has a territorial extension of 916,445 km². The continental territory is bordered on the north by the Caribbean Sea and the Atlantic Ocean, on the west by Colombia, Brazil on the south, Trinidad and Tobago to the north-east and on the east by Guyana. With this last country, the Venezuelan Government maintains a claim for Guayana Esequiba over an area of 159,542 km². For its maritime areas, it exercises sovereignty over 71,295 km² of territorial waters, 22,224 km² in its contiguous zone, 471,507 km² of the Caribbean Sea and the Atlantic Ocean under the concept of exclusive economic zone, and 99,889 km² continental shelf. This marine area borders those of thirteen States. The country has extremely high biodiversity and is ranked 7th in the world's list of nations with the most number of species.