The calculated distance (air line) between Yonggang-ŭp and Manp’o is approximately 165 miles respectively 266 kilometers.
By car or train, the actual journey to Manp’o is certainly longer, as only the direct route (as the crow flies) between Yonggang-ŭp and Manp’o has been calculated here.
Air line (approximately)
266 kilometers
144 nautical miles