The calculated distance (air line) between Corbii Mari and Piatra Neamţ is approximately 168 miles respectively 271 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Corbii Mari and Piatra Neamţ has been calculated here.
Air line (approximately)
271 kilometers
146 nautical miles