The calculated distance (air line) between Rostock and Nykøbing Falster is approximately 48 miles respectively 78 kilometers.
By car or train, the actual journey to Nykøbing Falster is certainly longer, as only the direct route (as the crow flies) between Rostock and Nykøbing Falster has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles