The calculated distance (air line) between Anyang-si and Yangp'yŏng is approximately 32 miles respectively 51 kilometers.
By car or train, the actual journey to Yangp'yŏng is certainly longer, as only the direct route (as the crow flies) between Anyang-si and Yangp'yŏng has been calculated here.
Air line (approximately)
51 kilometers
27 nautical miles