The calculated distance (air line) between Setakamachi-takayanagi and Ōita is approximately 66 miles respectively 106 kilometers.
By car or train, the actual journey to Ōita is certainly longer, as only the direct route (as the crow flies) between Setakamachi-takayanagi and Ōita has been calculated here.
Air line (approximately)
106 kilometers
57 nautical miles