The calculated distance (air line) between Sangsŏng-ni and Hamhŭng is approximately 62 miles respectively 100 kilometers.
By car or train, the actual journey to Hamhŭng is certainly longer, as only the direct route (as the crow flies) between Sangsŏng-ni and Hamhŭng has been calculated here.
Air line (approximately)
100 kilometers
54 nautical miles