The calculated distance (air line) between Yŏnan-ŭp and Chaeryŏng-ni is approximately 76 miles respectively 123 kilometers.
By car or train, the actual journey to Chaeryŏng-ni is certainly longer, as only the direct route (as the crow flies) between Yŏnan-ŭp and Chaeryŏng-ni has been calculated here.
Air line (approximately)
123 kilometers
66 nautical miles