Regarding the geography of ancient Korea, the location of the Pei River, which formed the border between the Western Han dynasty and the Joseon of Wiman, has long been a subject of sharp debate. This is because the Pei River is regarded as the western boundary of Gojoseon. The problem is that since the name Pei was recorded in the Records of the Shiji (史記), the course of the river has changed over time, and so various claims about its position have been presented. The theories concerning the location of the Pei River can be divided into the Korean Peninsula theories (Taedong River, Cheongcheon River, Yalu River), the Liaodong Peninsula theories (Yuni River, Hun River), and the former province of Liaoxi theories (Daling River, Luan River, Chaobai River). The theories claiming that the Pei River is either the Cheongcheon River or the Yalu River in North Korea have received the most support from domestic academia. However, the Korean Peninsula theories and the Liaodong Peninsula theories both have a problem in that the location and direction of the Pei River were not verified according to records made around the time such as the Hanshu (漢書), the Shuowen Jiezi (說文解字), and the Shuijing (水經). There was a Pei River on the border of Liaodong during the Western Han and, at that time, Liaodong appears to have been located in literature in the present-day Beijing area. Since the capital of Wiman Joseon was said to be in Changli County, Hebei Province, the Pei River recorded in the Records of the Shiji can only be a river between Beijing and Changli Count
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