Claim: Caofeidian District, which is located in the prefecture Tangshan, a coastal, industrial city in the northeast Heibei, China, occupies an area of 280 square miles.
Evidence: Caofeidian District (simplified Chinese: 曹妃甸区; traditional Chinese: 曹妃甸區; pinyin: Cáofēidiān Qū), formerly Tanghai County (唐海县; 唐海縣; Tánghǎi Xiàn), is a district of Tangshan, Hebei, People's Republic of China, along the coast of the Bohai Sea. As of 2003, it had a population of 140,000 residing in an area of 725 km (280 sq mi). A prefectural-level municipality (Chinese: 地级市), prefectural-level city or prefectural city; formerly known as province-administrated city (Chinese: 省辖市) from 1949 to 1983, is an administrative division of the People's Republic of China (PRC), ranking below a province and above a county in China's administrative structure. People's Republic of China Hebei Prefecture-level city Since the construction of the Caofeidian Project, it has hosted large iron and steel plants, chemical projects, and electricity plants.