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
Montgomery Reef Montgomery Reef Montgomery Reef is a reef off the Kimberley coast of Western Australia. It is situated at the south western end of Camden Sound and surrounds the Yawajaba (Montgomery) Islands. It is approximately off shore, opposite Doubtful Bay to the east and Collier Bay to the south. The nearest populated place is Bardi, which is approximately to the south west. It has a total area of making it Australia's largest inshore reef; its length is about . Montgomery Reef has an unusual wide tidal range, up to . When the tide is out, vast lagoons, sandstone islets, and a