The calculated distance (air line) between Kowŏn-ŭp and Sinsang-ni is approximately 17 miles respectively 27 kilometers.
By car or train, the actual journey to Sinsang-ni is certainly longer, as only the direct route (as the crow flies) between Kowŏn-ŭp and Sinsang-ni has been calculated here.
Air line (approximately)
27 kilometers
15 nautical miles