Asahi-dake or Mount Asahi (旭岳) is the tallest mountain in Hokkaidō, Japan. Part of the Daisetsuzan Volcanic Group of the Ishikari Mountains, it is located in the northern part of the Daisetsuzan National Park. The mountain is popular with hikers in the summer and can be easily reached from Asahidake Onsen via Asahidake Ropeway. During winter, the mountain is open for use by skiers and snowboarders. Sugatami Pond, directly below the peak, is famous for its reflection of the peaks, snow, and steam escaping from the volcanic vents. Sulphur was once mined in the fumarolic areas.
Mount Asahi is an active stratovolcano that arose 3 kilometres (1.9 mi) southwest of the Ohachi-Daira caldera. The Japan Meteorological Agency gave the region rank C in volcanic activity. In addition to the main peak, there is a smaller volcano emerging from the southeast shoulder of the mountain, Mount Ushiro Asahi or Rear Mount Asahi (後旭岳 Ushiro-Asahi-dake?). It is a stratovolcano 2,291 metres (7,516 ft) in height. The volcano consists mainly of andesite and dacite. That is Holocene volcanic non-alkali mafic rock less than 18,000 years old.