Mount Oakan (雄阿寒岳) is a stratovolcano located in Akan National Park in Hokkaidō, Japan.

Geography and geology

Mount Oakan sits in the Akan caldera northeast of Lake Akan. The volcano rises some 900 m above the surrounding terrain. The top of the volcano is 1370 m above sea level. The volcanic cone is some 8 km in diameter. There are three explosion craters at the summit. At Kitanakahara (北中腹) at about 800 m, there is a fumarole. The volcano is made mostly from non-alkali mafic volcanic rock. The main rock type is andesite and dacite.

History

Mount Oakan emerged in the Late Pleistocene dropping pumice on Minamishikata. After that, continuous lava flows formed the bulk of the volcano. In the final stages of its life, a parasitic volcano formed a lava dome at the summit. According to its name and local legend, Mount Oakan is the male counterpart to Mount Meakan on the other side of Lake Akan.