The calculated distance (air line) between Sŭngjibaegam and Manp’o is approximately 131 miles respectively 210 kilometers.
By car or train, the actual journey to Manp’o is certainly longer, as only the direct route (as the crow flies) between Sŭngjibaegam and Manp’o has been calculated here.
Air line (approximately)
210 kilometers
113 nautical miles