The trail is carved directly into high-purity crystalline limestone, which constitutes the primary rock layer of the Taroko region.
The narrow, winding shape of the gorge that gives the tunnel its name was created by the powerful erosive force of the Liwu River over millions of years.
The site was previously used as a section of the Central Cross-Island Highway before being converted into a dedicated pedestrian-only scenic trail.
Geological studies conducted here reveal folding and faulting patterns in the marble, offering a visual record of ancient tectonic activity.
The trail features high-altitude concrete overhangs specifically designed to deflect falling rocks, a critical safety feature given the terrain.
The Tunnel of Nine Turns is a 700-meter-long trail carved into the vertical marble cliffs of Taroko Gorge, following the path of the Liwu River. The name originates from the winding, serpentine nature of the gorge, which forces the road to turn repeatedly through the rock face. Visitors walk along a restored, safer section of the former Central Cross-Island Highway. The trail provides close-up views of the river's erosion patterns, where water has sculpted the marble into distinctive forms. Steep canyon walls rise hundreds of meters on both sides, creating a narrow corridor that limits direct sunlight. The area is prone to rockfalls, necessitating recent safety renovations and the installation of protective overhangs. It serves as a primary geological viewing site for understanding the tectonic uplift of Taiwan’s Central Mountain Range.
The mid-point of the trail where the gorge narrows most dramatically, offering a vertical perspective of the river below.
Check the official Taroko National Park website for real-time trail closures due to seismic activity or heavy rainfall before departing.
Bring a protective hat or helmet if one is provided at the entrance, as the canyon is geologically active.
Carry sufficient water, as there are no shops or vendors inside the tunnel section.
Attempting to touch or climb the marble walls, which are fragile and prone to crumbling; ignoring weather warnings regarding typhoons.
Trail access is subject to immediate closure during periods of heavy rain, typhoon warnings, or significant seismic activity.
Hard hats are recommended due to potential rockfall; stay within designated railings and do not climb on the marble formations.
