The calculated distance (air line) between Sŭngho 1-tong and Sinsang-ni is approximately 89 miles respectively 143 kilometers.
By car or train, the actual journey to Sinsang-ni is certainly longer, as only the direct route (as the crow flies) between Sŭngho 1-tong and Sinsang-ni has been calculated here.
Air line (approximately)
143 kilometers
77 nautical miles