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
Batt Reef Batt Reef Batt Reef is a coral reef off Port Douglas in Shire of Douglas, Queensland, Australia. Batt Reef is centred at and is part of the Great Barrier Reef. The reef is about 18 km long by 5 km (11 miles by 3 miles) wide, lying northwest to southeast, at the northern side of Trinity Passage that leads from the inner Reef channel from Trinity Bay to the Pacific Ocean. The north-west tip of the reef lies east of the Low Islets (Low and Woody Islands) which are in turn east of Newell Beach and northeast of Port Douglas.