The calculated distance (air line) between Gapyeong and Ganghwa-gun is approximately 56 miles respectively 91 kilometers.
By car or train, the actual journey to Ganghwa-gun is certainly longer, as only the direct route (as the crow flies) between Gapyeong and Ganghwa-gun has been calculated here.
Air line (approximately)
91 kilometers
49 nautical miles