The calculated distance (air line) between Greci and Piatra Neamţ is approximately 150 miles respectively 242 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Greci and Piatra Neamţ has been calculated here.
Air line (approximately)
242 kilometers
131 nautical miles