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 and 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 in Iran. Between Nizip and Cizre, D.400 is part of the European route E90.
The table below shows the locations between Datça and Esendere.[1]
D.550 at Gökova
D.555 near Dalaman
D.350 near Fethiye
D.635 near Finike
D.650 at Antalya
D.685 near Antalya Airport
D.687 at Bereket, Antalya Province
D.695 near Kızılağaç, Antalya Province
D.715 at Silifke
O-51 near Erdemli
D.815 at Adana
O-52 at Çakaldere, Adana Province
D.817 at Ceyhan O-52 near Tüysüz, Osmaniye Province D.817 near Tüysüz, Osmaniye Province
D.825 at Nurdağı
D.835 near Gaziantep
O-54 at Gaziantep O-52 at Gaziantep
P.27-26 at Nizip
D.885 at Şanlıurfa
D.905 at Viranşehir
D.950 at Kızıltepe
D.430 at Cizre
D.370 at Şırnak
D.975 near Bağışlı, Hakkari Province
Road 16 at Serow, West Azarbaijan