The calculated distance (air line) between Kangdong-ŭp and Kanggye is approximately 129 miles respectively 207 kilometers.
By car or train, the actual journey to Kanggye is certainly longer, as only the direct route (as the crow flies) between Kangdong-ŭp and Kanggye has been calculated here.
Air line (approximately)
207 kilometers
112 nautical miles