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The United States Virgin Islands is a group of islands in the Caribbean that are an insular area of the United States. The islands are geographically part of the Virgin Islands archipelago and are located in the Leeward Islands of the Lesser Antilles.

The U.S. Virgin Islands consist of the main islands of Saint Croix, Saint John and Saint Thomas, along with the much smaller but historically distinct Water Island, and many other surrounding minor islands. The total land area of the territory is 133.73 square miles (346.4 km2). As of the 2000 census the population was 108,612.

The U.S. Virgin Islands are located in the Caribbean Sea and the Atlantic Ocean, about 90 miles (140 km) east of Puerto Rico. The territory consists of four main islands: Saint Thomas, Saint John, Saint Croix, and Water Island, as well as several dozen smaller islands. The combined land area of the islands is roughly twice the size of Washington, D.C.

The U.S. Virgin Islands are known for their white sand beaches, including Magens Bay and Trunk Bay, and strategic harbors, including Charlotte Amalie and Christiansted. Most of the islands, including Saint Thomas, are volcanic in origin and hilly. The highest point is Crown Mountain, Saint Thomas (1,555 ft/474 m). Saint Croix, the largest of the U.S. Virgin Islands, lies to the south and has a flatter terrain. The National Park Service owns more than half of Saint John, nearly all of Hassel Island, and many acres of coral reef. (See also Virgin Islands National Park, Virgin Islands Coral Reef National Monument, Buck Island Reef National Monument, Christiansted National Historic Site, and Salt River Bay National Historical Park and Ecological Preserve.)

The Virgin Islands lie on the boundary of the North American plate and the Caribbean Plate. Natural hazards include earthquakes, tropical cyclones, and hurricanes.