Daisen is a volcanic mountain located in Tottori Prefecture, Japan. It has an elevation of 1,729 metres. This mountain is the highest in the Chūgoku region, and the most important volcano on the Daisen volcanic belt. The Daisen volcanic belt is a part of Southwest Honshū volcanic arc, where the Philippine Sea Plate is subducting under the Amurian Plate. Daisen is a complex volcano, made by repeated volcanic activity over thousands of years. Eruptions in this area started 1.8 million years ago and resulted in Old Daisen some 500,000 years ago. The Daisen of today, New Daisen, resulted from a second group of eruptions which started 50,000 years ago and ended 10,000 years ago in the caldera of Old Daisen. 50,000 years ago, this mountain had a plinian eruption from which volcanic ash can be found as far away as the Tohoku Region of Japan. This mountain is one of the 100 famous mountains in Japan, and also one of the Chūgoku 100 mountains.
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