The calculated distance (air line) between Koshigaya and Higashimurayama is approximately 20 miles respectively 33 kilometers.
By car or train, the actual journey to Higashimurayama is certainly longer, as only the direct route (as the crow flies) between Koshigaya and Higashimurayama has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles