The calculated distance (air line) between Ōgaki and Ōmihachiman is approximately 33 miles respectively 53 kilometers.
By car or train, the actual journey to Ōmihachiman is certainly longer, as only the direct route (as the crow flies) between Ōgaki and Ōmihachiman has been calculated here.
Air line (approximately)
53 kilometers
29 nautical miles