Otoyol 21

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Otoyol 21 (O-21), also known as the Ankara-Tarsus Motorway, is a toll road in central and southern Turkey. It runs from Gölbaşı near Ankara to Tarsus in Mersin Province, where it connects with the Adana–Mersin Motorway (O-51). When complete, the O-21 is part of the European route E90. The last section opened on 16 December 2020. At about 432 kilometers, it is the longest motorway in Turkey. The route passes through the Central Anatolia and Mediterranean regions, serving provinces including Ankara, Konya, Aksaray, Nevşehir, Niğde, Adana, and Mersin, with major cities Niğde and Tarsus along the way.