Zigana Tunnel (1988)

The Zigana Tunnel (Zigana Tüneli) is a road tunnel constructed on the Maçka, Trabzon–Torul, Gümüşhane state highway  southwest of the provincial border Trabzon–Gümüşhane, northeastern Turkey. It was opened to traffic in 1988.

Situated at Zigana Pass on the Pontic Mountains, the 1702 m-long tunnel was excavated in two years. The breakthrough took place on 2 September 1977. It carries one lane of traffic in each direction in one tube, which has 8.50 m clearance and 11.20 m width. The tunnel's elevation is at 1820 - 1795 m in the north-south direction.

New Zigana Tunnel
In September 2013, it was announced that a new tunnel is projected at Zigana Pass. The tunnel was opened in 2023. It is a 14481 m-long twin-tube tunnel carrying two lanes of traffic in each direction between Güzelyayla, Maçka and Köstere, Torul at 1253 - 1211 m elevation.