An onsen or hot spring is a natural phenomenon where hot water gushes out from the ground due to the heat of volcanic mountains and is also the name given to mean places where such water wells up. In addition, bathing facilities making use of this natural hot water are generally called onsen.
Onsen are more abundant in Japan than any other country in the world. Mineral elements in the water have various beneficial effects on the body, such as easing stress, promoting relaxation and therapy. Onsen Hot Spring resorts are well known to Japanese people as very popular travel destinations.

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