The calculated distance (air line) between Hŭngnam and Yŏnggwang-ŭp is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Yŏnggwang-ŭp is certainly longer, as only the direct route (as the crow flies) between Hŭngnam and Yŏnggwang-ŭp has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles