Could be that is where we get the water, and why it's so good for the skin.I have always wondered if there is a cave complex under the hotel that connects to where the hot springs are located.
It could be that there are some crystals down there, and that adds some fairy magic to the water. XD
In our world, there are several types of hot spring water, some are rich in sulfur, silica, calcium, sodium, or bicarbonate, each one claiming to have some different medicinal benefits.
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