The calculated distance (air line) between Kop’ung and Changam-ch’on is approximately 149 miles respectively 239 kilometers.
By car or train, the actual journey to Changam-ch’on is certainly longer, as only the direct route (as the crow flies) between Kop’ung and Changam-ch’on has been calculated here.
Air line (approximately)
239 kilometers
129 nautical miles