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
Kenn Reef Kenn Reef Kenn Reef is a submerged coral atoll off the Pacific coast of Queensland, Australia. It is about 15 by 8 km and appears as either a backward facing “L“ or a boot. The reef covers an area of approximately 40 km², with an islet in the Southeast part of the reef called Observatory Cay which is approximately 2 m above the high tide level It is part of the Coral Sea Islands and is over 280 nm north-east from Gladstone, Queensland. Kenn Reef is located on part of a submerged continental block, called the Kenn Plateau. This block