The Taiping Huanyu Ji, or "Universal Geography of the Taiping (Xingguo) Era [976–983]," is a 10th-century AD geographical treatise by Chinese scholar Yue Shi 樂史 (930–1007), written during the reign of Emperor Taizong of Song in the Northern Song dynasty. Comprising 200 scrolls, it has entries for nearly all areas of China at the time of its publication, complete with place-names and their etymologies. The work generally follows Tang dynasty systems of geographical and political designation, dividing China into 13 "Circuits", and then subdividing further into the more traditional "prefectures" and "counties". Because it is largely based on Tang works, it constitutes an important source for the study of Tang geography.