Guó PrefectureGuozhou or Guo Prefecture was a zhou in imperial China, centering on modern Sanmenxia, Henan, China. It existed from 583 until 1271.GeographyThe administrative region of Guozhou in the Tang dynasty is in modern Sanmenxia in western Henan on the border with Shaanxi. It probably includes parts of modern: Lingbao CityLushi County