Yi'an District (simplified Chinese: 义安区; traditional Chinese: 義安區; pinyin: Yì'ān Qū) formerly Tongling County, is a district in Anhui province, China. It is under the administration of Tongling City. It is in the south of Anhui Province and lies on the southern bank of Yangtze River. The total area is 1,113 km2 (430 sq mi). The population (Han nationality) is 716,300. Yi'an is a district with many rare aquatic animals, such as the white dolphin, finless porpoise and Yangtze alligator. Tongling, an origin of Chinese bronze culture, is known as “Chinese Ancient Bronze Capital”.