The calculated distance (air line) between Iwŏn-ŭp and Sinsang-ni is approximately 81 miles respectively 130 kilometers.
By car or train, the actual journey to Sinsang-ni is certainly longer, as only the direct route (as the crow flies) between Iwŏn-ŭp and Sinsang-ni has been calculated here.
Air line (approximately)
130 kilometers
70 nautical miles