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Hot spring is a kind of spring water, which comes from underground naturally. The temperature of the spring is significantly higher than the average annual temperature of the local underground natural spring water, and the mineral spring water contains trace elements which are beneficial to human health. Now there are many areas of artificial drilling, generally in the 600-2000 meters, with the deep water pump pumping groundwater, rich in a variety of beneficial minerals, the water temperature is generally above 20 degrees, also known as the hot spring well. Due to the different climates, latitudes and elevations, the lower limit of hot spring temperature is difficult to be unified.