Anguilla (/ænˈɡwɪlə/ ann-GWIL-ə) is a British overseas territory in the Caribbean. It is one of the most northerly of the Leeward Islands in the Lesser Antilles, lying east of Puerto Rico and the Virgin Islands and directly north of Saint Martin. The territory consists of the main island of Anguilla, approximately 16 miles (26 kilometres) long by 3 miles (5 km) wide at its widest point, together with a number of much smaller islands and cays with no permanent population. The territory's capital is The Valley. The total land area of the territory is 35 square miles (91 km2), with a population of approximately 14,731 (2018).

Anguilla is a flat, low-lying island of coral and limestone in the Caribbean Sea, measuring some 16 miles (26 km) long and 3.5 miles (6 km) in width. It lies to the east of Puerto Rico and the Virgin Islands and directly north of Saint Martin, separated from that island by the Anguilla Channel. The soil is generally thin and poor, supporting scrub, tropical and forest vegetation. The terrain is generally low-lying, with the highest terrain located in the vicinity of The Valley; Crocus Hill, Anguilla's highest peak at 240 feet (73 m), lies in the western regions of the town.

Anguilla is noted for its ecologically important coral reefs and beaches. Apart from the main island of Anguilla itself, the territory includes a number of other smaller islands and cays, mostly tiny and uninhabited: