Geothermal features are natural phenomena that occur due to the heat from the Earth's interior. These features include hot springs, geysers, fumaroles, and mud pots. They are often found in areas with volcanic activity, where heat from magma rises to the surface, heating groundwater and creating these unique formations. Hot springs are pools of heated water, while geysers are intermittent fountains of water and steam. Fumaroles release steam and gases, and mud pots are bubbling pools of mud. Notable locations for geothermal features include Yellowstone National Park in the United States and Iceland, known for its volcanic landscape.