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
Unmanned reef lights of the Florida Keys looked like smaller versions of the older reef lights, but had no keeper's quarters. The first two unmanned lights in the Florida Keys, the Molasses Reef Light and the Pacific Reef Light, were built to the same plan in 1921. The Molasses Reef Light is still standing, but the lantern has been removed, and a NOAA automatic weather station now sits at the top of the tower. The tower, which is painted brown, stands in of water. The United States Coast Guard indicates that a lightship was stationed at Pacific Reef starting in 1838. The Pacific Reef Light erected in