Tung-Kwan, Ho-nan, China (Google Maps ⧉, OpenStreetMap ⧉)

"… which are passable throughout this length only by the Great Central Asian trade route to T’ai-yuan fu and by the Tung-Kwan, Ho-nan, i.e. the Yellow River route."

"Tung-’an in Fokien, ii. 243n"

"…both Nan-yué and Kiao-Chi represent Northern Annam, i.e. the portion of Annam which we call Tung-king."