The calculated distance (air line) between Hamhŭng and Sŭngho 1-tong is approximately 105 miles respectively 169 kilometers.
By car or train, the actual journey to Sŭngho 1-tong is certainly longer, as only the direct route (as the crow flies) between Hamhŭng and Sŭngho 1-tong has been calculated here.
Air line (approximately)
169 kilometers
91 nautical miles