Spa
Hot springs means that groundwater heated by volcanic activity or high geothermal heat is exposed on the surface. In Korea, groundwater over 25 ℃ is defined as hot spring. Therefore, there is a problem that when the hot spring is inspected in a hot summer, the temperature is higher than that. It is often said that it contains many minerals in the basement, so bathing in hot springs is known to help a variety of health. The hot springs are mainly distributed along the volcanic basin, and many hot springs are scattered throughout Japan, where the Pacific Rim earthquake zone passes. However, there are cases where harmful substances that do not contribute to health are included. In this case, there is a sign that prohibits hot spring bathing.