Truk Islands, or Chuuk, a group of the Caroline Islands in the western Pacific Ocean, some 1,700 miles (2,700 km) east of the Philippines. The islands form one of the four states making up the Federated States of Micronesia. They consist of about 100 volcanic islands encircled by a coral reef. The largest are Tol, Moen, and Fefan. Together they make up about 60 per cent of Truk's area of 46 square miles (119 km2). Most of the people are Micronesians and live by fishing and farming.

Truk was acquired by Spain in 1686 and sold to Germany in 1899. During World War I it was seized by Japan, which later annexed it. A major Japanese naval base here was destroyed by the U.S. Navy in 1944 during World War II. Truk was administered by the United States as part of the Trust Territory of the Pacific Islands from 1947 until 1986, when the Federated States of Micronesia was formed.

Population: about 50,000.