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