Thermal pools are natural bodies of water that are heated by geothermal activity beneath the Earth's surface. These pools can be found in various locations around the world, often in volcanic regions. The warm water is rich in minerals, which can provide therapeutic benefits to those who soak in them. Many thermal pools are located in national parks or hot spring resorts, attracting visitors seeking relaxation and wellness. The temperature of these pools can vary, with some being hot enough for bathing while others are more suitable for a comfortable dip. Popular examples include the Blue Lagoon in Iceland and Yellowstone National Park in the United States.