The waterfall is formed by the vertical incision of the Neishuangxi River into volcanic lava flows from the Datun Volcano Group.
The area surrounding the trail is a natural habitat for the Formosan blue magpie and various species of endemic tree frogs.
The name 'Juansi' (Silk Thread) refers to the thin, stream-like appearance the waterfall takes during periods of low precipitation.
The waterfall is positioned along a historical trail that once connected the coastal areas to the Shilin district for commercial trade.
Juansi Waterfall is a multi-tiered cascade situated within the Yangmingshan National Park volcanic landscape. The waterfall originates from the Neishuangxi River and flows over igneous rock formations characteristic of the area. The trail leading to the site is part of the larger Jinbaoli historic path network, historically used for transporting sulfur and fish. The cascade height is approximately 20 meters, with a distinct tiered appearance during moderate water flow. The surrounding vegetation consists of subtropical broadleaf forest, featuring dense ferns and moss-covered stones. The site serves as a vital observation point for local biodiversity, including endemic amphibians and aquatic insects.
The wooden viewing platform directly facing the waterfall, which provides a clear perspective of all tiers.
Wear footwear with high-traction outsoles, as the moisture from the waterfall makes nearby stone steps extremely slippery.
Bring a lightweight raincoat, as the mist from the waterfall creates a localized microclimate regardless of general weather conditions.
Carry sufficient hydration and snacks, as there are no vendor facilities once you depart the main trailhead.
Attempting the hike during or immediately after heavy typhoon rains, as the trail is prone to minor landslides and high-velocity water runoff.
Stay on the marked stone paths to prevent soil erosion; do not disturb the local aquatic fauna or water sources.
