The water at Lengshuikeng averages 40 degrees Celsius, which is significantly cooler than other springs in the Yangmingshan area.
The milky appearance of the water is caused by sediment precipitation from sulfur and iron, creating the local 'Milk Lake'.
Lengshuikeng was formed by a lava dam created by volcanic activity that blocked a valley, creating a former lakebed.
The sediment here is rich in sulfur crystals and iron, forming a unique chemical composition rarely found elsewhere in Taipei.
It sits at an elevation of approximately 750 meters above sea level.
Lengshuikeng is a unique geological site in Yangmingshan National Park, known for its volcanic hot springs and mineral-rich waters. It is named 'Cold Water Pit' because the water temperature, while still warm, is lower than other nearby volcanic springs. The site features a free outdoor public foot-soaking pool and separate gender-segregated bathing areas. The water is milky white due to high sulfur and mineral concentrations. Nearby, the Qingtiangang Grassland and the volcanic lake known as Milk Lake are accessible via interconnected trails. The area is a key hub for hikers exploring the mountainous topography of Taipei. Its natural setting showcases volcanic activity, including ongoing gas emissions. The facility includes a visitor center with educational exhibits about local geology and ecology.
The viewing platform overlooking the sulfur-rich, milky-colored Milk Lake.
Bring a towel and soap, as they are not provided at the public bathing facilities.
Wear hiking-appropriate footwear to explore the surrounding trails, as the paths can be uneven.
Check the local weather forecast specifically for the mountain region, as it can differ drastically from downtown Taipei.
Do not wander off marked trails, as the area contains active volcanic vents and steep, potentially unstable terrain.
The public hot spring facilities are closed for maintenance on designated days each week; check the official Yangmingshan National Park website before departure.
Shower thoroughly before entering the pools; swimwear is required in the public foot-soaking area; gender-segregated hot spring pools typically require nudity.
