The calculated distance (air line) between Kanggye and P’yŏngsŏng is approximately 125 miles respectively 201 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Kanggye and P’yŏngsŏng has been calculated here.
Air line (approximately)
201 kilometers
108 nautical miles