Nobody knows when and where a natural disaster will occur.

To the south-east of Lake Toya Hot Springs lies Mt. Usu, an active volcano that has erupted four times in the last 100 years. However, eruptions are preceded by earthquakes, often about three days in advance, but otherwise the mountain is very calm. Volcanic activity has given birth to beautiful scenery, and springs are created by the mountain's natural gifts which are how the Lake Toya Hot Springs were formed.