The calculated distance (air line) between Ansan-si and Gwangmyeong is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Gwangmyeong is certainly longer, as only the direct route (as the crow flies) between Ansan-si and Gwangmyeong has been calculated here.
Air line (approximately)
18 kilometers
9 nautical miles