Johnson South Reef Johnson South Reef Johnson South Reef (; ), also known as Chigua Reef in China, Gạc Ma Reef in Vietnam and Mabini Reef in the Philippines is a reef in the southwest portion of the Union Banks in the Spratly Islands of the South China Sea. It is controlled by the People's Republic of China (PRC), but its ownership is disputed by the PRC, the Philippines, Taiwan, and Vietnam. Johnson South Reef lies adjacent to the Vietnamese-controlled Collins Reef (also known as Johnson North Reef) which lies to the northwest. It is naturally above water only at low tide. Prior
Apo Reef from Mindoro and about from Nanga and Tara Islands, the nearest of the islands off Busuanga Island on the western side of the Mindoro Strait. The Apo Reef Light, situated on the northeast part of the island, warns ship about the location of this navigational hazard. The island is situated at a two and a half hour navigation 240° from Sablayan by pump boat (banka). The island houses a permanent ranger base which is monitoring the national park. An administrative desk is collecting the environmental fees. It is possible to stay overnight in tents subject to certain conditions. Very limited