The Zao-san is an active volcanic complex at the border of the Yamagata and Miyagi Prefectures. The central volcano includes several lava domes and a tuff cone, known as Goshiki-dake with the Okama crater lake. The crater lake has a diameter of 360 metres (60 metres deep) and was formed by a volcanic eruption (about 1720).
Its highest summit is the Kumano-dake at 1'841 m. Other summits of the range are the Katta-dake (1'758 m(, Zizousan (1'736m), Gandosan (1'485 m) and Myougouhou (1'491 m). The Zao-san is a famous ski resort and one of the 100 famous Japanese mountains.
Japan 1951, Zao-san.
The Zao-san is a well known ski resort. It is one of only a few places in Japan, where juhyo "ice trees" can be seen. Also known as "snow monsters", the trees take on curious shapes due to the heavy snowfall and freezing winds.
Japan 1966, Zao-san, Okama Crater Lake.
Japan 1997, Zao-san, Okama Crater Lake.
Japan 2007, Zao-san, Okama Crater Lake.
Japan 2013, Zao-san,
Kumano-dake 1841 m.
The stamp was issued in the sheet "Japanese Mountains Series No. 2".