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
Tod Sirod Reef sea cucumbers. Fish observed at the reef include mangrove and lane snappers, sheepshead, spadefish, jack-knifefish, butterfly fish, grouper, angelfish, wrasse, and grunts. Tod Sirod Reef Tod Sirod Reef, formerly known as Collier 1 Reef is an artificial reef in the Gulf of Mexico, off the coast of Collier County, Florida. It is part of a network of artificial reefs off the coast of the county. Construction of the reef was done by a public-private partnership in 2015 The reef is composed of pyramid-shaped limestone reef modules and old concrete benches. Since their installation, the reef structure has been colonized by