The Archipelago of San Andrés, Providencia and Santa Catalina, or San Andrés and Providencia, is one of the departments of Colombia, and the only one located geographically in Central America. It consists of two island groups in the Caribbean Sea about 775 km northwest of mainland Colombia, and eight outlying banks and reefs. The largest island of the archipelago and Colombia is called San Andrés and its capital is San Andrés. The other large islands are Providencia and Santa Catalina Islands which lie to the north-east of San Andrés; their capital is Santa Isabel.