Mindoro (mĭndôˈrō) [key], island (1990 pop. 832,642), 3,759 sq mi (9,736 sq km), 7th largest of the Philippines, SW of Luzon. Its mountainous interior rises to c.8,500 ft (2,590 m) at Mt. Halcon. What little arable land there is on the island is devoted largely to subsistence farming. Coal is mined, and lumbering is an important industry. Puerto Gabera is a well-known beach area.