Xiaoyoukeng Fumarole Trail

The Xiaoyoukeng Fumarole Trail explores an active volcanic area on the flank of the Qixing volcano inside Yangmingshan National Park, in Beitou District, northern Taiwan. The trailhead is at Xiaoyoukeng on Yangming Road Section 2, served by Bus 108 and Bus 260 to the Xiaoyoukeng stop; no permit or entry fee is required. The walk is about 3 km as a loop toward the Qixing junction and takes 1.5 to 2.5 hours at an elevation of roughly 800 to 900 m, with only modest climbing, which suits the moderate rating given the uneven ground and gas conditions. The first section is a short boardwalk and paved path leading to fuming vents, where yellow crystalline sulfur deposits coat the rocks and a strong smell of hydrogen sulfide hangs in the air. Beyond the viewing area, a longer ridge path of stone steps and dirt continues through low shrubs and silvergrass, with exposure to wind and little shade. Key landmarks are the main fumarole field, the yellow-stained slopes and the junction with the trail toward Qixing Mountain, which is the usual turn-around for those not continuing to the summit. There are no huts or drinking water sources, so visitors bring water and rain gear. Sulfur gas concentrations vary with wind and season, and the national park posts notices and closes sections when levels are unsafe. Visitors with asthma or heart conditions should be cautious near the vents, and a mask helps on gas-heavy days. Metal items and jewellery can tarnish near the fumaroles. The surrounding grassland and ridges are often shrouded in fog, which reduces visibility and makes the paths slippery. Autumn and spring give the most comfortable conditions, and the site can also be combined with the Qixing Mountain climb for a longer day. The same roadside bus stop provides the simplest bail-out option.