Otoyol 31 abbreviated as , aka İzmir-Aydın Otoyolu (Izmir-Aydın Motorway), is a toll

Toll road

A toll road is a privately or publicly built road for which a driver pays a toll for use. Structures for which tolls are charged include toll bridges and toll tunnels. Non-toll roads are financed using other sources of revenue, most typically fuel tax or general tax funds...

 motorway in the Aegean Region

Aegean Region

Aegean Region , is one of the 7 census-defined regions of Turkey, and in Western Asia.It is located in the west part of the country: bounded by Aegean Sea on the west; Marmara Region on the north;...

 of Turkey

Turkey

Turkey , known officially as the Republic of Turkey , is a Eurasian country located in Western Asia and in East Thrace in Southeastern Europe...

 connecting the cities of İzmir

Izmir

Izmir is a large metropolis in the western extremity of Anatolia. The metropolitan area in the entire Izmir Province had a population of 3.35 million as of 2010, making the city third most populous in Turkey...

 and Aydın

Aydin

Aydın is a city in and the seat of Aydın Province in Turkey's Aegean Region. The city is located at the heart of the lower valley of Büyük Menderes River at a commanding position for the region extending from the uplands of the valley down to the seacoast...

.

The motorway links to the beltway of Izmir on its northern end and connects to the state road bypassing Aydın in the south. On its total length of 108 km (67.1 mi), the O-31 connects to the European route .

Located at the province border of Izmir

Izmir Province

İzmir Province is a province of Turkey in western Anatolia on the Aegean coast, whose capital is the city of İzmir. On the west it is surrounded by the Aegean sea, and it encloses the Gulf of İzmir. Its area is 11,973 km.2, population 3.948.848 . The population was 3,370,866 in 2000...

 and Aydın

Aydin Province

Aydın Province is a province of southwestern Turkey, located in the Aegean Region. The provincial capital is the city of Aydın which has a population of approx. 150,000 . Other towns in the province include the summer seaside resorts of Didim and Kuşadası.-History:Aydın was founded by the ancient...

between Belevi and Germencik and went in service on June 20, 2000, the Selattin Tunnel , is with its length of 2043 m (6,702.8 ft) Turkey's longest road tunnel.

From Izmir to Aydın
K6	Işıkkent
K1	Tahtalıçay
K2	Torbalı
K3	Belevi
	75. Yıl Selattin Tunnel 3043 m (9,983.6 ft)
K4	Germencik
K5	Şevketiye
K6	Aydın South