To the mountain
First of all, Japanese for beginners, especially for mountain sports enthusiasts: “dake” means mountain in Japanese. So the mountain we walked up is called Asahi. :) Moving on: My quick Google research revealed that it is actually an active (strato-)volcano which last erupted 200 years ago. The whole thing is easy to believe when you stand in the huge oval crater and are surrounded by a cloud of steam every now and then. The summit of the volcano is 2291 metres, making it the highest mountain on Hokkaido. However, the fumeroles are distributed in the crater, which lies at 1724m and can be easily reached by gondola, which drops you off at 1600m. The mountain is located in the Daisetzu-san National Park, where there are also many other great mountains and volcanoes to discover ;)