The calculated distance (air line) between Songgangdong and Taesal-li is approximately 63 miles respectively 102 kilometers.
By car or train, the actual journey to Taesal-li is certainly longer, as only the direct route (as the crow flies) between Songgangdong and Taesal-li has been calculated here.
Air line (approximately)
102 kilometers
55 nautical miles