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The Virgin Islands are an archipelago between the North Atlantic Ocean and Caribbean Sea, geographically forming part of the Leeward Islands of the Lesser Antilles in the Caribbean islands or West Indies. Geologically separated from the rest of the Lesser Antilles by the Anegada Passage, all of the islands except for Saint Croix lie on the same continental shelf platform as the main island of Puerto Rico, which is itself separated from rest of the Greater Antilles by the Mona Passage and Cayon. Politically, the islands fall into three jurisdictions: the easternmost British overseas territory of the Virgin Islands, informally referred to as the British Virgin Islands, the central unincorporated American territory of the Virgin Islands of the United States, commonly known as the U.S. Virgin Islands, and the westernmost island-municipalities of the unincorporated American territory of Puerto Rico, officially named Vieques and Culebra but generally called the Spanish Virgin Islands or Puerto Rican Virgin Islands.