is a list of peaks and their heights: Northern Group: 1585 m 1559 m 1537 m 1548 m 1478 m 1360 m 1324 m 1251.7 m 1240.4 m 1202 m Southern Group: 1516.6 m Includes 1516.6 m and 1342 m 1449.9 m 1416.5 m 1353.7 m 1339.6 m 1297.8 m 1199.0 m 1183 m Wetlands The Hakkōda Mountains are famous for their high-altitude wetlands: Sennin Wetland (仙人岱) Kenashi Wetlands (毛無岱) Tamo Wetland (田茂萢) Suiren Pond (睡蓮沼) Tashiro Plateau Wetland (田代平湿原) Geology The Hakkōda Mountains are two clusters of stratovolcanoes in the Northeastern Japan Arc that consists of lava flows, debris flows, and pyroclastic ejecta and flows arranged into southern and northern groups. The volcanic peaks are made of non-alkali mafic rock; mostly andesite, dacite, and basalt. Although both groups of mountains formed in the Pleistocene, the southern group is older than the northern group. The southern group is made from rock that is 700,000 to 1,700,000 years old, while the northern group is made from rock that is 13,000 to 700,000 years old along the southwestern rim of an older caldera. Eight eruptive events have occurred in the Northern Hakkōda Volcanic Group since 4,000 BCE, including phreatic and vulcanian eruptions. Four eruptive events occurred at the summit of Ōdake, with another possible eruption at Ōdake. The three most recent eruptions occurred at Jigokunuma on the southwestern foot of Ōdake near Sukayu Onsen during the 13th to 17th centuries. Modern activity and the current threat Two fatal incidents have happened in modern history due to volcanic gas emitted from the northern group. On 12 July 1997, three soldiers of the Japan Self-Defense Forces died after gas accumulated in the valley they were training in. On 20 June 2010, a teenage girl died after being exposed to volcanic gas near Sukayu Onsen. After the 2011 Great East Japan earthquake, seismic activity around the volcanic group increased. After a series of earthquakes between February and October 2013, Mount Ōdake saw a degree of deformation. Future eruptions are forecast to come from the peak of Mount Ōdake and Jigokunuma, a volcanic crater lake. Large scale eruptions from Mount Ōdake have the potential to send lahars (volcanic mudflows) to heavily populated areas of the cities of Aomori and Towada, to the northwest and east, respectively, of the volcanic complex. Potential lahars would flow to Towada by the Oirase River and its tributaries and to Aomori