The calculated distance (air line) between Samho-rodongjagu and Namp’o is approximately 156 miles respectively 251 kilometers.
By car or train, the actual journey to Namp’o is certainly longer, as only the direct route (as the crow flies) between Samho-rodongjagu and Namp’o has been calculated here.
Air line (approximately)
251 kilometers
135 nautical miles