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

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 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.^[1]

Exit list

Province	District	km	mi	Exit	Destinations	Notes
Ankara	Gölbaşı	0.0	0.0	K8	O-20 (Ankara beltway) — Ankara
		14.4	8.9	K1	D.260 — Haymana, Ankara
		16.9	10.5	Gölbaşı Toll Plaza
		29.5	18.3	K2	D.750 — Ahıboz
		76.1	47.3	K3	D.753 — Kulu
	Şereflikoçhisar	101.5	63.1	K4	D.757 — Acıkuyu
Aksaray	Sarıyahşi	139.5	86.7	K5	P.68-83 — Sarıyahşi
	Ağaçören	157.5	97.9	K6	Kırşehir connector — Kırşehir
	Ortaköy	178.3	110.8	K7	D.757 — Kırşehir, Ortaköy
	Aksaray	213.6	132.7	K8	D.300 — Aksaray, Nevşehir
Nevşehir	Derinkuyu	241.6	150.1	K9	P.68-83 — Sarıyahşi
Niğde	Niğde	275	171	K10	P.51-78 — Gölcük
				K11	D.765 — Nevşehir
				K11	D.805 — Kayseri
				K12	D.805 — Niğde / Aydın Ave.
	Bor			K13	P.51-51 — Kemerhisar
	Ulukışla			K14	O-21A — Konya
				Kırkgeçit Tunnels
				Çakıt Tunnel
Adana	Pozantı			K15	D.750 — Pozantı	Pozantı north
				K16	D.750 — Pozantı	Northbound exit, southbound entrance only.
				K17	D.750 — Akçatekir
Mersin	Tarsus			K18	D.750 — Çamalan
				K19	O-51 — Mersin, Adana
				Tarsus Toll Plaza
				K20	D.400 — Mersin, Adana
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Incomplete access Tolled Unopened