The abundant rainfall in Yilan permeates through limestone stratum and the plate tectonic movement releases carbon dioxide that mixes with the water and becomes gassy carbonic acid water. This explains how a cold spring is formed. When you walk into the cold spring you might feel a chill, but your body will get hotter later on. And, it’s fun to see gassy bubbles covering your entire body. Reputedly, by bathing in it, cold springs cure skin diseases while drinking spring water cures gastrointestinal problems.
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