The calculated distance (air line) between Sunan and P’yŏngsŏng is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to P’yŏngsŏng is certainly longer, as only the direct route (as the crow flies) between Sunan and P’yŏngsŏng has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles