The calculated distance (air line) between Sunch’ŏn and Hyesan-dong is approximately 180 miles respectively 290 kilometers.
By car or train, the actual journey to Hyesan-dong is certainly longer, as only the direct route (as the crow flies) between Sunch’ŏn and Hyesan-dong has been calculated here.
Air line (approximately)
290 kilometers
156 nautical miles