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
Penfield Reef Light Penfield Reef Light Penfield Reef Lighthouse is a lighthouse in Connecticut, United States, on Penfield Reef at the south side of Black Rock Harbor entrance on the Long Island Sound, off the coast of Fairfield, Connecticut. Constructed in 1874, it was one of the last offshore masonry lights. Most offshore lights built after this were cast iron towers built on cylindrical cast iron foundations. Penfield Reef has been called one of the most treacherous areas of western Long Island Sound. The structure is about off Fairfield Beach, on one end of the reef. The lighthouse's foundation, structure and roofs were