Demirciköy Tunnel

Demirciköy Tunnel (Demirciköy Tüneli) is a highway tunnel constructed in Sinop Province, northern Turkey.

Demirciköy Tunnel is part of the Sinop-Samsun Highway within the Black Sea Coastal Highway, of which construction was carried out by the Turkish Dağcan Construction and Trade Company Inc. The 1680 and 1680 m-long twin-tube tunnel carrying two lanes of traffic in each direction is flanked by 1285 - 1285 m-long Çiftlik Tunnel in the north and 348 - 348 m-long Gerze Tunnel in the south on the same highway.

The tunnel was opened to traffic on 26 March 2014.