Thermal springs are natural hot water sources that occur when groundwater is heated by geothermal energy from the Earth's interior. This heated water rises to the surface, often creating pools or streams that can be warm or hot, depending on the temperature of the geothermal source. These springs can be found in various locations around the world, often in volcanic regions. Many thermal springs are rich in minerals, which can provide health benefits and are often used for therapeutic purposes. People visit these springs for relaxation and wellness, as they are believed to help with conditions like arthritis and skin issues. Popular examples include the Blue Lagoon in Iceland and Yellowstone National Park in the United States.