Isla Culebra () (Snake Island) is an island-municipality of Puerto Rico originally called Isla Pasaje and Isla de San Ildefonso. It is located about seventeen miles east of the Puerto Rican mainland, twelve miles west of St. Thomas and nine miles north of Vieques. Culebra is spread over 5 wards and Culebra (Dewey) Pueblo (The downtown area and the administrative center of the city). The island is also known as Isla Chiquita (Little Island) and Ultima Virgen (Last Virgin). Residents of the island are known as "Culebrenses".