The calculated distance (air line) between Gwangmyeong and Yŏnan-ŭp is approximately 49 miles respectively 78 kilometers.
By car or train, the actual journey to Yŏnan-ŭp is certainly longer, as only the direct route (as the crow flies) between Gwangmyeong and Yŏnan-ŭp has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles