The Azores are an archipelago of nine volcanic islands located in the middle of the North Atlantic Ocean. The islands are known for their geothermal springs, which are heated by the Earth’s interior and are used for bathing, swimming, and other recreational activities. Popular geothermal springs in the Azores include Caldeira das Sete Cidades, Furnas, Terra Nostra, and Poça da Dona Beija.