Apo Reef is a coral reef system in the Philippines situated on the western waters of Occidental Mindoro province in the Mindoro Strait. Encompassing 34 square kilometres (13 sq mi), it is the world's second-largest contiguous coral reef system and the largest in the country.[2] The reef and its surrounding waters are protected areas in the country administered as the Apo Reef Natural Park.
^"Apo Reef Natural Park". UNESCO World Heritage: Tentative Lists. UNESCO. 2006-05-16. Archived from the original on 11 October 2007. Retrieved 2007-10-08.