The calculated distance (air line) between Boltiere and Terno d'Isola is approximately 6 miles respectively 10 kilometers.
By car or train, the actual journey to Terno d'Isola is certainly longer, as only the direct route (as the crow flies) between Boltiere and Terno d'Isola has been calculated here.
Air line (approximately)
10 kilometers
5 nautical miles