天長隧道

Tianchang Tunnel

April 30th, 2026

This abandoned tunnel cuts through Tianchang Cliff (天長斷崖) along a Taipower access road in the upper Mugua River basin deep in the mountains of Xiulin, Hualien. Taipower dug the 1,270 meter-long passage in 1978 as part of the Qilai Water Diversion Project (奇萊引水工程), bypassing the unstable surface route of the old Nenggao Traversal Road (能高越嶺道) used during the Japanese colonial period. The tunnel is the longest marble-walled tunnel in Taiwan, with no concrete lining and no lighting, leaving the raw stone exposed and glimmering when illuminated. A collapse in the middle section has since rendered it impassable to vehicles, and the wider Qilai route is closed to all but Taipower and Forestry Bureau personnel.

Map

Warning: this location is abandoned, hazardous, or otherwise neglected and may be unsafe and even dangerous! Exercise appropriate precautions when visiting.

警告：此處已廢棄或長期無人管理，可能存在潛在危險。造訪時請務必提高警覺，並做好相關安全防護措施。