Demirciköy Tunnel
Demirciköy Tunnel (), 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 -long twin-tube tunnel carrying two lanes of traffic in each direction is flanked by -long Çiftlik Tunnel in the north and -long Gerze Tunnel in the south on the same highway. The tunnel was opened to traffic on 26 March 2014.