The calculated distance (air line) between Anbyŏn-ŭp and Hyesan-dong is approximately 166 miles respectively 268 kilometers.
By car or train, the actual journey to Hyesan-dong is certainly longer, as only the direct route (as the crow flies) between Anbyŏn-ŭp and Hyesan-dong has been calculated here.
Air line (approximately)
268 kilometers
144 nautical miles