The calculated distance (air line) between T’ongch’ŏn-ŭp and Namp’o is approximately 135 miles respectively 216 kilometers.
By car or train, the actual journey to Namp’o is certainly longer, as only the direct route (as the crow flies) between T’ongch’ŏn-ŭp and Namp’o has been calculated here.
Air line (approximately)
216 kilometers
117 nautical miles