The calculated distance (air line) between Roznov and Piatra Neamţ is approximately 10 miles respectively 17 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Roznov and Piatra Neamţ has been calculated here.
Air line (approximately)
17 kilometers
9 nautical miles