The most important valleys are the Kocaeli Valley, the Balıkesir Ovası ( Balıkesir Plain ), the Bursa Ovası ( Bursa Plain ), and the Plains of Troy ( historically known as the Troad.
The most important valleys are the Kocaeli Valley, the Bursa Ovasi ( Bursa Basin ), and the Plains of Troy ( historically known as the Troad.
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