The calculated distance (air line) between Tanuma and Ōmamachō-ōmama is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Ōmamachō-ōmama is certainly longer, as only the direct route (as the crow flies) between Tanuma and Ōmamachō-ōmama has been calculated here.
Air line (approximately)
29 kilometers
15 nautical miles