It is about 15 by 6 kilometers in size, with an area of 65 km2 composed mostly of lagoon.[1] It is in the northern area lies Roncador Cay. It also has a small coral reef.[2]
Initially claimed by the United States under the Guano Islands Act of 1856, the atoll was ceded by the United States to Colombia on September 17, 1981, as the result of the Vásquez–Saccio Treaty (signed in 1972).[3]
There are several dilapidated houses on it built by American troops during the Cuban Missile Crisis.