The calculated distance (air line) between Gongchangling and Panghyŏn-dong is approximately 127 miles respectively 204 kilometers.
By car or train, the actual journey to Panghyŏn-dong is certainly longer, as only the direct route (as the crow flies) between Gongchangling and Panghyŏn-dong has been calculated here.
Air line (approximately)
204 kilometers
110 nautical miles