Mount Meakan

 is an active stratovolcano located in Akan National Park in Hokkaidō, Japan. It is the tallest mountain in the Akan Volcanic Complex. 
The volcano consists of nine overlapping cones that grew out of the Akan caldera, on the shores of Lake Akan. Mount Meakan has a triple crater at its summit. According to its name and local legend, Mount Meakan is the female counterpart to Mount Oakan on the other side of Lake Akan.
Geography.
There are two ponds in the crater, 赤沼 (Sekinuma, "Red Pond") and 青沼 (Aonuma, "Blue Pond").