The calculated distance (air line) between Balıkesir and Gölmarmara is approximately 65 miles respectively 104 kilometers.
By car or train, the actual journey to Gölmarmara is certainly longer, as only the direct route (as the crow flies) between Balıkesir and Gölmarmara has been calculated here.
Air line (approximately)
104 kilometers
56 nautical miles