D-400 is an east–west state road in southern Turkey. The 2,057-kilometre (1,278 mi) road starts at Datça in the southwest corner of the Anatolian peninsula. The road ends at the Iranian border at Esendere.D-400 runs through the cities of Marmaris, Fethiye, Antalya, Alanya, Mersin, Adana, Gaziantep, Şanlıurfa, and Hakkâri and links to Road 16 25px in Iran. Between Nizip and Cizre, D-400 is part of the European route E90.
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