Otoyol 51 (), abbreviated as O-51, aka Adana-Erdemli Otoyolu (), is a toll motorway in the Mediterranean Region of Turkey, connecting the cities Adana and Mersin. The motorway is on its full length of part of international routes as of European routes E90 and E982 and Asian Highway 84.
The motorway starts from the western terminus of O-52 in Central Adana, runs westward reaching the south terminus of Pozantı-Adana Motorway O-21 northeast of Tarsus, continues southwest to Mersin bypassing it at north and terminates in Erdemli.
There are plans to extend the motorway to Silifke.
Exit list
Light blue indicates toll section of motorway.