The calculated distance (air line) between Shirahamachō-usazakiminami and Sumoto is approximately 32 miles respectively 51 kilometers.
By car or train, the actual journey to Sumoto is certainly longer, as only the direct route (as the crow flies) between Shirahamachō-usazakiminami and Sumoto has been calculated here.
Air line (approximately)
51 kilometers
28 nautical miles