The calculated distance (air line) between Hoemul-li and Yŏnggwang-ŭp is approximately 152 miles respectively 244 kilometers.
By car or train, the actual journey to Yŏnggwang-ŭp is certainly longer, as only the direct route (as the crow flies) between Hoemul-li and Yŏnggwang-ŭp has been calculated here.
Air line (approximately)
244 kilometers
132 nautical miles