The calculated distance (air line) between Koksan-ŭp and P’yŏngsŏng is approximately 53 miles respectively 86 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Koksan-ŭp and P’yŏngsŏng has been calculated here.
Air line (approximately)
86 kilometers
46 nautical miles