The calculated distance (air line) between Sinanju and Chaeryŏng-ŭp is approximately 83 miles respectively 133 kilometers.
By car or train, the actual journey to Chaeryŏng-ŭp is certainly longer, as only the direct route (as the crow flies) between Sinanju and Chaeryŏng-ŭp has been calculated here.
Air line (approximately)
133 kilometers
72 nautical miles