The calculated distance (air line) between Rostov-na-Donu and Yeysk is approximately 77 miles respectively 125 kilometers.
By car or train, the actual journey to Yeysk is certainly longer, as only the direct route (as the crow flies) between Rostov-na-Donu and Yeysk has been calculated here.
Air line (approximately)
125 kilometers
67 nautical miles