01 / Oshamambe Onsen
Hot water surged upduring a gas test drilling.

The town writes that in 1955, while test-drilling for natural gas, hot spring water erupted by chance along with the gas, and that water from sources found later is piped to the inns. The town has another hot spring, Futamata Radium Onsen, whose open-air bath looks onto a travertine dome.
- Erupted in 1955
- By chance during gas drilling
- Two hot springs of different types
