The calculated distance (air line) between Sŭngjibaegam and Yŏnggwang-ŭp is approximately 110 miles respectively 177 kilometers.
By car or train, the actual journey to Yŏnggwang-ŭp is certainly longer, as only the direct route (as the crow flies) between Sŭngjibaegam and Yŏnggwang-ŭp has been calculated here.
Air line (approximately)
177 kilometers
96 nautical miles