The calculated distance (air line) between Néa Mákri and Agios Dimitrios is approximately 17 miles respectively 27 kilometers.
By car or train, the actual journey to Agios Dimitrios is certainly longer, as only the direct route (as the crow flies) between Néa Mákri and Agios Dimitrios has been calculated here.
Air line (approximately)
27 kilometers
15 nautical miles