The calculated distance (air line) between Ōmamachō-ōmama and Kawaguchi is approximately 50 miles respectively 80 kilometers.
By car or train, the actual journey to Kawaguchi is certainly longer, as only the direct route (as the crow flies) between Ōmamachō-ōmama and Kawaguchi has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles