Gemlik is a harbor town and district of Bursa Province at the southern gulf of Armutlu Peninsula on the Sea of Marmara's coast in Turkey. It is at approximately 29 km (18 mi) from Bursa and not far from Istanbul. The harbour is one of the most important in Turkey. Somewhat east of Gemlik, a few remains of the ancient Greek town of Kios can be found.Gemlik is also renowned with its olives and olive oils. Marmara Birlik, a cooperative of olive farmers and producers, has ranked as top one among the olive producers in the World.The popular Kurşunlu beaches are in Gemlik.