Nagdhunga tunnel
Nagdhunga tunnel (Nepali) is a 2.68-kilometre-long (1.67 mi) highway tunnel connecting Sisnekhola of Dhading district and Nagdhunga in Kathmandu. The tunnel is part of Tribhuvan highway. It is Nepal's first modern road tunnel. The tunnel has a height of 8.3m and has a lane of 9.5m wide.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).