The calculated distance (air line) between Kanggye and Yŏnggwang-ŭp is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Yŏnggwang-ŭp is certainly longer, as only the direct route (as the crow flies) between Kanggye and Yŏnggwang-ŭp has been calculated here.
Air line (approximately)
129 kilometers
70 nautical miles