The calculated distance (air line) between Feldru and Piatra Neamţ is approximately 85 miles respectively 137 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Feldru and Piatra Neamţ has been calculated here.
Air line (approximately)
137 kilometers
74 nautical miles