Daisetsuzan Volcanic Group, Volcanic mountains in Kamikawa district, Japan

The Daisetsuzan Volcanic Group is a collection of peaks formed by volcanic activity in the Kamikawa district of Hokkaidō. The formation creates a high mountain range with more than a dozen summits, some rising above 2,200 meters.

The peaks ring the 2 km wide Ohachi-Daira caldera, and the group lies at the north end of the Daisetsu-Tokachi graben on the Kurile arc. Ainu names for the massif include Nutapukaushipe, "the mountain above the river". In 1918 Koizumi Hideo published a geological study with a map giving detailed place names; peaks such as Mamiya-dake and Matsuda-dake take the surnames of explorers Mamiya Rinzō and Matsuda Ichitarō.

The Ainu call the range Nutapukaushipe, 'the mountain above the river', or Optateske together with the Tokachi peaks. Many summit names date from 1918, when geologist Koizumi Hideo mapped the range and drew on Ainu place names where they existed; others honour figures such as Mamiya Rinzō and Matsuura Takeshirō.

Hiking trails start from several trailheads accessible by gravel roads, and they pass through terrain with varying degrees of steepness. In winter, most routes close, and access requires appropriate mountain gear and experience.

Steaming fumaroles and hot springs remain active at several locations, reminding visitors that the mountains are still geologically young. Some springs feed natural pools where hot water collects before flowing into the surrounding streams.