Turks and Caicos consists of two groups of islands. The Turks group is composed of Grand Turk Island, Salt Cay, and lesser cays. The Caicos group consists of six principal islands: South Caicos, North Caicos, Middle Caicos, East Caicos, and West Caicos. More than four fifths of the population lives on three islands. The islands are home to the third largest coral system in the world. The waters are crystal clear and compliment the white sand beaches.