The calculated distance (air line) between Cheongsong gun and Gyeongsan-si is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to Gyeongsan-si is certainly longer, as only the direct route (as the crow flies) between Cheongsong gun and Gyeongsan-si has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles