D.550 is a north to south state road in Turkey. It runs mostly along the west coast of Turkey. It starts at Edirne and ends in Muğla. First 226 kilometres (140 mi) of the road is in European portion of Turkey. Between Eceabat and Çanakkale it passes over the Strait of Çanakkale (popularly known as Dardanelles) by ferryboat. The rest of the road is in the Asiatic (so called Anatolia) portion of Turkey.
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