Why do you think hot springs are hot?
If they are in volcanic areas, you may imagine that the magma body heats underground water.
However, it cannot explain scalding hot water gushing in the area where there are no active volcanos nearby.
In fact, movements of plates of the earth create some hot springs.
Kansai Region, Rating [5/5] Extremely Hot, Hydrogen Sulfide, Lodging, Sightseeing
Do you associate Yoshino in Nara with cherry blossom viewing?
300 years ago, Mt. Yoshino was also a training site for ascetic pilgrims.
There remains a historical hot spring, where some of them debauched around the water.
Kansai Region, Rating [3/5] Lodging, Metallic Smell, Opaque
Do you know real Arima Onsen?
Arima is counted among Thee Ancient Springs and is near big cities like Osaka and Kobe, and some of you may have been there.
However, this historical spa city is facing depletion of the water; therefore, there are few inns providing real hot springs in terms of water not artificially processed.
Kansai Region, Rating [5/5] Extremely Hot, Lodging, Metallic Smell, Opaque