The calculated distance (air line) between Babadag and Piatra Neamţ is approximately 180 miles respectively 290 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Babadag and Piatra Neamţ has been calculated here.
Air line (approximately)
290 kilometers
157 nautical miles