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A hot spring is a spring produced by the emergence of geothermally heated groundwater from the Earth's crust. Hot springs are in many places, especially in mountains.
There is no universally accepted definition of a hot spring. For example, one can find the phrase hot spring defined as
- any geothermal spring [1]
- a spring with water temperatures above its surroundings [2][3]
- a spring with water temperatures above 50 °C (122 °F) [4]
- a natural spring with water temperature above body temperature – normally between 36.5 and 37.5 °C (97.7 and 99.5 °F) [5][6][7][8][9]
- a natural spring of water greater than 21.1 °C (70 °F) (synonymous with thermal spring) [10][11][12][13]
- a natural discharge of groundwater with elevated temperatures [14]
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The water issuing from a hot spring is heated by geothermal energy, i.e., heat from the Earth's mantle.
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