Shimokita Peninsula
The mountain is one peak of the , a series of eight somma volcanos ranging from east to west in the centre of Shimokita Peninsula. Mount Osore has a height of . Although Mount Osore last erupted over 10,000 years ago, the area has many fumaroles emitting steam and/or volcanic gases (especially sulfur dioxide) indicating that it is still an active volcano. Lake Usori is a caldera lake at the center of Mount Osore, with highly acidic waters.