British Virgin Islands, British overseas territory in the eastern Caribbean Sea. It is part of an island chain collectively known as the Virgin Islands, which makes up the northeastern extremity of the Greater Antilles. Puerto Rico lies to the west. The British territory consists of 4 larger islands (Tortola, Anegada, Virgin Gorda, and Jost Van Dyke) and 32 smaller islands and islets, of which more than 20 are uninhabited; lesser islands include Great Tobago, Salt, Peter, Cooper, Norman, Guana, Beef, Great Thatch, Little Thatch, and Marina Cay. The chief town and port is Road Town on Tortola (21 square miles [54 square km]), the largest of the islands. The total area of the colony is 59 square miles (153 square km). Pop. (2010) 28,054.