The calculated distance (air line) between Yonggang-ŭp and Sinŭiju is approximately 102 miles respectively 164 kilometers.
By car or train, the actual journey to Sinŭiju is certainly longer, as only the direct route (as the crow flies) between Yonggang-ŭp and Sinŭiju has been calculated here.
Air line (approximately)
164 kilometers
89 nautical miles