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Otoyol 21 (English: Motorway 21), abbreviated as O-21, a.k.a. Ankara-Tarsus Otoyolu (English: Ankara-Tarsus Motorway), is a completed tollmotorway in the Central Anatolia and Mediterranean regions in Turkey. Currently, it connects Otoyol 20 from Gölbaşı, Ankara with the Adana-Mersin Motorway O-51 at Tarsus in Mersin Province. On its full length, it is part of the European E90. The last part of the highway opened on 16 December 2020. With a length of 432 kilometres, the O-21 is the longest motorway in Turkey.
O-21
E90
O-20 (Ankara beltway) — Ankara
D.260 — Haymana, Ankara
D.750 — Ahıboz
D.753 — Kulu
D.757 — Acıkuyu
P.68-83 — Sarıyahşi
D.300 — Aksaray, Nevşehir
D.765 — Nevşehir
D.805 — Kayseri
O-21A — Konya
O-51 — Mersin, Adana
D.400 — Mersin, Adana
Otoyol routes in Turkey