P’u-chau fu, China (Google Maps ⧉, OpenStreetMap ⧉)

"…P’u-chau fu lies on a level with the Yellow River, and on the edge of a large extent of worthless marsh land…"

"P’u-p’iao, in a little valley between the Mekong and the Salwen Rivers, was the place through which the P’u and the Piao entered China."