The mountain is part of the Datun Volcano Group, which last erupted approximately 200,000 to 300,000 years ago.
Sulfur deposits can be observed along the Xiaoyoukeng trail, where steam constantly escapes from the earth's crust.
The mountain experiences a distinct 'cloud sea' phenomenon during autumn and winter months, often sitting above the fog layer.
The vegetation changes significantly with altitude, transitioning from subtropical broadleaf forests at the base to arrow bamboo grasslands at the summit.
The mountain's name, 'Shichisei' or 'Seven Star,' refers to the seven small peaks that crown the volcanic complex.
The peak is one of the few places in the Taipei metropolitan area where temperatures can drop near freezing during strong cold fronts in January or February.
Shichisei Mountain, or Qixingshan, stands as the highest peak in Taipei City and the highest dormant volcano in Taiwan, reaching an elevation of 1,120 meters. Located within Yangmingshan National Park, the area is characterized by its post-volcanic geological features, including active sulfur fumaroles and steaming vents. The mountain consists of three peaks—the Main, East, and South peaks—which offer panoramic views of the Taipei Basin and the North Coast. Hiking trails vary in terrain, transitioning from stone steps to exposed volcanic rock ridges. The mountain's climate is notably cooler than the city center, often shrouded in thick mist due to its elevation and northern exposure. Because of its volcanic nature, the surrounding Beitou area is world-renowned for its geothermal hot springs.
The summit marker at the Main Peak offers a 360-degree view, while the vents at the Xiaoyoukeng area provide dramatic steam-filled shots.
Carry a windproof jacket even in summer, as weather conditions at the summit change rapidly.
Ensure your footwear has good grip, as the stone steps and rock paths can become extremely slippery in the frequent mist.
Bring extra water, as there are no shops or refill stations once you are on the hiking trails.
Attempting the climb during typhoon warnings or severe thunderstorms, as the ridges offer no shelter and become dangerous.
Stay on marked trails to avoid unstable volcanic ground and sulfur vents; pack out all trash to preserve the protected national park environment.
