The 'Water Curtain' is formed by groundwater trapped during the excavation of the tunnel, which continuously drains through cracks in the rock ceiling.
The entire Baiyang Trail was originally intended as a service road for the now-abandoned Baiyang Dam project.
The rock layers in the tunnel consist of marble, which is common throughout the Taroko Gorge geological region.
The water inside the cave remains cool year-round due to its origin as high-mountain spring water.
The path to the cave is marked by multiple tunnels; the Shuilian Cave is the final destination at the end of the officially maintained trail section.
The Baiyang Trail Shuilian Cave is a distinctive water-filled tunnel carved directly into the cliffside of Taroko National Park. Visitors traverse a man-made tunnel to reach the cave, where groundwater naturally seeps through the rock fissures and cascades into a shallow, ankle-deep channel. The trail leading to the cave spans approximately 2.1 kilometers one way, passing through several shorter tunnels and crossing the Liwu River. Originally constructed by the Taipower Company to facilitate a hydropower project, the tunnel was repurposed for public recreation after the project was decommissioned. The cave experience involves walking through a curtain of spring water, requiring waterproof gear to navigate the slippery, dark passageway. It is located at the 166.5K mark of the Central Cross-Island Highway.
The entrance of the cave where the water pours down against the daylight filtering in from the tunnel opening.
Bring a high-quality raincoat or poncho, as you will be soaked by the water spray inside the cave.
Wear non-slip footwear, such as water shoes or sport sandals with a back strap, to manage the slick, rocky floor.
Carry a headlamp or waterproof flashlight, as the tunnel becomes completely dark as you venture deeper.
Bring a dry bag to protect electronic devices and personal items while inside the cave.
Do not enter the tunnel without footwear, as the floor is jagged and slippery; avoid visiting during or immediately after heavy rainfall due to high risks of tunnel rockfall.
The trail is frequently closed following typhoons, earthquakes, or heavy rain due to high geological instability; check Taroko National Park's official trail status page before departure.
Avoid splashing others intentionally, as the path is narrow; remove footwear if requested to keep the delicate environment clean; follow all posted safety warnings regarding falling rocks.
