Location: Martas is 100km W of Istanbul, on the N shore of the Sea of Marmara. General overview: Martas handles silver sand, grain, steel products, vegetable oils and general cargo. Military and NATO vessels also handled. Traffic figures: Approx 1,783,000t of cargo and 530 vessels handled annually. Load line zone: Summer. Max size: LOA 250m, draught 13.0m, 45,000DWT.