The calculated distance (air line) between Ōmamachō-ōmama and Hamamatsu is approximately 148 miles respectively 238 kilometers.
By car or train, the actual journey to Hamamatsu is certainly longer, as only the direct route (as the crow flies) between Ōmamachō-ōmama and Hamamatsu has been calculated here.
Air line (approximately)
238 kilometers
128 nautical miles