The calculated distance (air line) between Sultangazi and Marmara Ereğlisi is approximately 49 miles respectively 78 kilometers.
By car or train, the actual journey to Marmara Ereğlisi is certainly longer, as only the direct route (as the crow flies) between Sultangazi and Marmara Ereğlisi has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles