The calculated distance (air line) between Ágios Athanásios and Kalamariá is approximately 15 miles respectively 24 kilometers.
By car or train, the actual journey to Kalamariá is certainly longer, as only the direct route (as the crow flies) between Ágios Athanásios and Kalamariá has been calculated here.
Air line (approximately)
24 kilometers
13 nautical miles