Otoyol 21

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O-21
Ankara-Tarsus Motorway Ankara-Tarsus Otoyolu
Route information
Part of E90
Length	432 km (268 mi)
Major junctions
From	Gölbaşı, Ankara Province
To	Tarsus, Mersin Province
Location
Country	Turkey
Regions	Central Anatolia, Mediterranean
Provinces	Ankara, Konya, Aksaray, Nevşehir, Niğde, Adana, Mersin
Major cities	Niğde, Tarsus
Highway system
Highways in Turkey Motorways List State Highways List
← O-20 → O-21A

Otoyol 21 (English: Motorway 21), abbreviated as O-21, a.k.a. Ankara-Tarsus Otoyolu (English: Ankara-Tarsus Motorway), is a completed toll motorway 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.^[1] With a length of 432 kilometres, the O-21 is the longest motorway in Turkey.