A hot spring is a spring produced by the emergence of geothermally heated groundwater that rises from the Earth's crust. There are geothermal hot springs in many locations all over the crust of the earth. While some of these springs contain water that is a safe temperature for bathing, others are so hot that immersion can result in injury or death.
There is no universally accepted definition of a hot spring. For example, one can find the phrase hot spring defined as any geothermal spring
a spring with water temperatures above its surroundings
a natural spring with water temperature above body temperature – normally between 36.5 and 37.5 °C (97.7 and 99.5 °F)
a natural spring with warm water above body temperature
a thermal spring with water warmer than 36.7 °C (98 °F)
a natural spring of water greater than 21.1 °C (70 °F) (synonymous with thermal spring)
a natural discharge of groundwater with elevated temperatures
a type of thermal spring in which hot water is brought to the surface. The water temperature of a hot spring is usually 6.5 °C (12 °F) or more above mean air temperature. Note that by this definition, "thermal spring" is not synonymous with the term "hot spring"
a spring whose hot water is brought to the surface (synonymous with a thermal spring). The water temperature of the spring is usually 8.3 °C (15 °F) or more above the mean air temperature.
a spring with water above the core human body temperature – 36.7 °C (98 °F).
a spring with water above average ambient ground temperature
a spring with water temperatures above 50 °C (122 °F)
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