The calculated distance (air line) between Ōkuchi-shinohara and Matsuyama is approximately 174 miles respectively 281 kilometers.
By car or train, the actual journey to Matsuyama is certainly longer, as only the direct route (as the crow flies) between Ōkuchi-shinohara and Matsuyama has been calculated here.
Air line (approximately)
281 kilometers
151 nautical miles