Zigana Tunnel is a twin tube road tunnel in the Black Sea Region of Turkey. Located on the provincial border of Gümüşhane and Trabzon, the tunnel carries routes D.885 (E97) between Torul, Gümüşhane in the south and Maçka, Trabzon in the north. It is the country's longest tunnel with a length of 14,481 m (47,510 ft).