Virgin Islands of the United States, group of 3 islands and about 50 islets, most of which are uninhabited, in the Lesser Antilles chain of the West Indies, east of Puerto Rico and lying between the Caribbean Sea and the Atlantic Ocean. The three islands, with their areas, are Saint Thomas (73 sq km/28 sq mi), Saint John (52 sq km/20 sq mi), and Saint Croix (207 sq km/80 sq mi). The capital is Charlotte Amalie, on Saint Thomas. A 2007 real estate survey has estimated the population of the US Virgin Islands at 108,448.