"Mangyan" is the collective name of seven ethnolinguistic group inhabiting most of the highland region of Mindoro, the seventh largest island in the northern end of the vast basin of the Sulu Sea, south of Batangas and the mainland southern Luzon, and west of the Bicol region. Most parts of the island are mountainous. There are still small stretches of flatlands, and the rest are coastal areas. These plains are home to non-Mangyan groups such as Tagalog, Visayan, and Ilocano.