The calculated distance (air line) between Yamazakichō-nakabirose and Sandachō is approximately 39 miles respectively 63 kilometers.
By car or train, the actual journey to Sandachō is certainly longer, as only the direct route (as the crow flies) between Yamazakichō-nakabirose and Sandachō has been calculated here.
Air line (approximately)
63 kilometers
34 nautical miles