The calculated distance (air line) between Stary Krym and Nizhnegorskiy is approximately 34 miles respectively 54 kilometers.
By car or train, the actual journey to Nizhnegorskiy is certainly longer, as only the direct route (as the crow flies) between Stary Krym and Nizhnegorskiy has been calculated here.
Air line (approximately)
54 kilometers
29 nautical miles