The calculated distance (air line) between Marmara Ereğlisi and Maltepe is approximately 63 miles respectively 101 kilometers.
By car or train, the actual journey to Maltepe is certainly longer, as only the direct route (as the crow flies) between Marmara Ereğlisi and Maltepe has been calculated here.
Air line (approximately)
101 kilometers
54 nautical miles