The calculated distance (air line) between T’ongch’ŏn-ŭp and Sunch’ŏn is approximately 110 miles respectively 177 kilometers.
By car or train, the actual journey to Sunch’ŏn is certainly longer, as only the direct route (as the crow flies) between T’ongch’ŏn-ŭp and Sunch’ŏn has been calculated here.
Air line (approximately)
177 kilometers
95 nautical miles