The calculated distance (air line) between Tumbotino and Nizhniy Novgorod is approximately 44 miles respectively 71 kilometers.
By car or train, the actual journey to Nizhniy Novgorod is certainly longer, as only the direct route (as the crow flies) between Tumbotino and Nizhniy Novgorod has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles