Gaoligongshan Tunnel or Gaoligong Mountain Rail Tunnel[6] (Chinese: 高黎贡山隧道) is a 34.5 km (21.4 mi)[Note 1] tunnel between Nujiang Station and Longling Station on the Dali–Ruili railway in Yunnan, China.

[4] It passes through the entirety of Longling County and then into Mangshi.

[1] Upon completion, it will be the longest mountain railway tunnel in Asia.

[5] The tunnel is the key project of Dali–Ruili railway between Dali and Ruili.

[3] The tunnel boring machine "Colorful Cloud No.1"(Chinese: 彩云一号) began work on 28 August 2017.