The calculated distance (air line) between Kitakyushu and Maebaru-chūō is approximately 42 miles respectively 68 kilometers.
By car or train, the actual journey to Maebaru-chūō is certainly longer, as only the direct route (as the crow flies) between Kitakyushu and Maebaru-chūō has been calculated here.
Air line (approximately)
68 kilometers
37 nautical miles