The calculated distance (air line) between Castelnuovo Rangone and Castel Maggiore is approximately 21 miles respectively 34 kilometers.
By car or train, the actual journey to Castel Maggiore is certainly longer, as only the direct route (as the crow flies) between Castelnuovo Rangone and Castel Maggiore has been calculated here.
Air line (approximately)
34 kilometers
18 nautical miles