The calculated distance (air line) between Temryuk and Rostov-na-Donu is approximately 176 miles respectively 282 kilometers.
By car or train, the actual journey to Rostov-na-Donu is certainly longer, as only the direct route (as the crow flies) between Temryuk and Rostov-na-Donu has been calculated here.
Air line (approximately)
282 kilometers
152 nautical miles