The calculated distance (air line) between Sangsŏng-ni and Sunch’ŏn is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Sunch’ŏn is certainly longer, as only the direct route (as the crow flies) between Sangsŏng-ni and Sunch’ŏn has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles