The Turks and Caicos Islands (abbreviated TCI; and ) are a British Overseas Territory consisting of the larger Caicos Islands and smaller Turks Islands, two groups of tropical islands in the Lucayan Archipelago of the Atlantic Ocean and northern West Indies. They are known primarily for tourism and as an offshore financial centre. The resident population was 31,458 of whom 23,769 live on Providenciales in the Caicos Islands; July 2020 estimates put the population at 55,926. It is the third largest of the British overseas territories by population.