The calculated distance (air line) between Sŭngam-nodongjagu and Kanggye is approximately 167 miles respectively 269 kilometers.
By car or train, the actual journey to Kanggye is certainly longer, as only the direct route (as the crow flies) between Sŭngam-nodongjagu and Kanggye has been calculated here.
Air line (approximately)
269 kilometers
145 nautical miles