There are 7 hot springs in Kyushu that can produce bubbles. You must take a look at the "Beppu Hell Hot Springs"
The "Beppu Hell Hot Springs" includes seven hot springs, each of which presents a blue, red, orange, muddy state due to different geological influences. In addition, the water temperature exceeds 95 degrees Celsius, and boiling water vapor rises violently from the surface, creating a magnificent appearance filled with smoke everywhere.
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