The calculated distance (air line) between Gidrotorf and Nizhniy Novgorod is approximately 20 miles respectively 33 kilometers.
By car or train, the actual journey to Nizhniy Novgorod is certainly longer, as only the direct route (as the crow flies) between Gidrotorf and Nizhniy Novgorod has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles