The calculated distance (air line) between Boyalık and Marmara Ereğlisi is approximately 41 miles respectively 65 kilometers.
By car or train, the actual journey to Marmara Ereğlisi is certainly longer, as only the direct route (as the crow flies) between Boyalık and Marmara Ereğlisi has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles