The calculated distance (air line) between Holboca and Piatra Neamţ is approximately 66 miles respectively 107 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Holboca and Piatra Neamţ has been calculated here.
Air line (approximately)
107 kilometers
58 nautical miles