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Wen'an (Chinese: 文安; pinyin: Wén'ān) is a county of east-central Hebei province, China, on the upper reaches of the Daqing River (大清河), a tributary of the Hai River. It is under the administration of Langfang City, and, as of 2004[update], had a population of 460,000 residing in an area of 980 km2 (380 sq mi).