The calculated distance (air line) between Treviolo and Terno d'Isola is approximately 4 miles respectively 6 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 Treviolo and Terno d'Isola has been calculated here.
Air line (approximately)
6 kilometers
3 nautical miles