Kandovan Tunnel
| Kandovan Tunnel | |
|---|---|
Kandovan Tunnel In 2024; the green sign reads "11th Tunnel" (تونل شماره ۱۱) | |
Interactive map of Kandovan Tunnel | |
| Overview | |
| Other name | 11th Tunnel of Chalus Road |
| Coordinates | 36°09′13.8″N 51°18′44.0″E / 36.153833°N 51.312222°E |
| Crosses | Kandovan Pass: 3,030 m (9,940 ft) |
| Operation | |
| Work begun | 1935 |
| Opened | 17 May 1938 |
| Closed | 1995 |
| Reopened | 2002 |
| Technical | |
| Length | 1,883 m (6,178 ft) |
| No. of lanes | Two |
| Operating speed | 50 km/h |
| Highest elevation | 2,700 m (8,900 ft) |
| Tunnel clearance | 6 m (20 ft) |
| Width | 5.5 m (18 ft) |
The Kandovan Tunnel (Persian: تونل کندوان), officially 11th Tunnel (Persian: تونل شماره ۱۱), is a major road tunnel on Chalus Road, Iran. The 1,883-metre (6,178 ft) tunnel crosses Alborz, connecting Alborz province to Mazandaran province. It was completed in 1938 as one of the first tunnels in Iran in order to make the route from Tehran to Caspian Sea passable in harsh winter times.