[1] It is located within Akan National Park, about 50 km Northwest of Kushiro in eastern Hokkaidō, Japan.

Akan-ko[2]), which fills a 24×13 km caldera,[3] the tallest being Me-Akan (Meakan), O-Akan (Oakan) and Akan-Fuji.

Its elongated shape is due to its incremental formation during major explosive eruptions, from the early to the mid-Pleistocene periods.

The Me-Akan group of nine overlapping cones on the eastern side of Lake Akan has had mild eruptions since the beginning of the 19th century.

Its summit contains the active craters of Ponmachineshiri and Naka-Machineshiri, sites of frequent phreatic eruptions in historical time.