Mt. Iwaonupuri, standing at 1116 meters, is part of the Niseko mountain range and is an active volcano with two craters at its summit, which is barren of vegetation. You can reach the trailhead at Goshiki Onsen by car or bus, where two parking areas are available. About Iwaonupuri To the north of Mt. Iwaonupuri flows the Sulfur River. In the past, there was a sulfur mining site along this river, which is no longer in operation. The sulfur mine existed since the late Edo period, but it began full-scale operations during the Meiji period when the demand for sulfur, … Continue reading Mt.Iwaonupuri (Niseko mountain range), Light trekking with family.