The calculated distance (air line) between Hiroshima and Maebaru-chūō is approximately 141 miles respectively 227 kilometers.
By car or train, the actual journey to Maebaru-chūō is certainly longer, as only the direct route (as the crow flies) between Hiroshima and Maebaru-chūō has been calculated here.
Air line (approximately)
227 kilometers
123 nautical miles