The Virgin Islands (Islas Vírgenes) are an archipelago in the Caribbean Sea. They are geologically and biogeographically the easternmost part of the Greater Antilles, the northern islands belonging to the Puerto Rico Trench and St. Croix being a displaced part of the same geologic structure. Politically, the British Virgin Islands have been governed as the western island group of the Leeward Islands, which are the northern part of the Lesser Antilles, and form the border between the Caribbean Sea and the Atlantic Ocean. The archipelago is separated from the true Lesser Antilles by the Anegada Passage and from the main island of Puerto Rico by the Virgin Passage. The islands fall into three different political jurisdictions: Virgin Islands, informally referred to as British Virgin Islands, a British overseas territory, Virgin Islands of the United States, an unincorporated territory of the United States, Spanish Virgin Islands, the easternmost islands of the Commonwealth of Puerto Rico, itself an unincorporated territory of the United States. Christopher Columbus named the islands after Saint Ursula and the 11,000 Virgins (Santa Úrsula y las Once Mil Vírgenes), shortened to the Virgins (las Vírgenes). The official name of the British territory is the Virgin Islands, and the official name of the U.S. territory is the Virgin Islands of the United States. In practice, the two island groups are almost universally referred to as the British Virgin Islands and the U.S. Virgin Islands. Danish West IndiesHistory of the United States Virgin IslandsHistory of the British Virgin Islands and History of Puerto Rico The Virgin Islands were originally inhabited by the Arawak and Carib, many of whom are thought to have perished during the colonial period due to enslavement, foreign disease, and war brought about by European colonists. European colonists later settled here and established sugar plantations, at least one tobacco plantation, and purchased people for slavery taken from Africa.