The calculated distance (air line) between Okayama and Tondabayashichō is approximately 96 miles respectively 154 kilometers.
By car or train, the actual journey to Tondabayashichō is certainly longer, as only the direct route (as the crow flies) between Okayama and Tondabayashichō has been calculated here.
Air line (approximately)
154 kilometers
83 nautical miles