The calculated distance (air line) between Yamazakichō-nakabirose and Sōja is approximately 51 miles respectively 81 kilometers.
By car or train, the actual journey to Sōja is certainly longer, as only the direct route (as the crow flies) between Yamazakichō-nakabirose and Sōja has been calculated here.
Air line (approximately)
81 kilometers
44 nautical miles