Otoyol 21

Otoyol 21 (Motorway 21), abbreviated as O-21, a.k.a. Ankara-Tarsus Otoyolu (Ankara-Tarsus Motorway), is a completed toll motorway in the Central Anatolia and Mediterranean regions in Turkey. Currently, it is connecting 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.