In Caldas Novas there are 86 active wells, pumping an average of 1,200 m3 an hour, in a period of 14 daily hours. The temperature of the water varies between 34 and 57 °C. The first references to the hot water of this region were published in Spain in 1545. In 1722,
Bartolomeu Bueno da Silva, son of the famous
bandeirante, Anhangüera, turning off the trail blazed by his father years before, discovered the thermal springs that form the Rio Quente. These were called Caldas Velhas and were located in the place where the Rio Quente Resorts is now located. The most important study about the thermal ism of Caldas Novas and the Rio Quente was carried out by the state enterprise Furnas Centrais Elétricas, due to the possible influence of the Usina Hidrelétrica Corumbá I dam on the thermal water table of the region, which would be under the risk of cooling. According to Furnas, the phenomenon of the hot water is produced by peculiar geological and topographic characteristics. For years it was thought that a volcano had existed in the area in whose crater rainwater infiltrated, heating at great depths and then returning to the surface by way of cracks in the rock. More modern studies show that there is no indication of volcanic activity in the region. Studies show that the water is formed by rainfall that is stored in a layer of quartzite and due to pressure is sent to the surface in a column 600 meters. The suspicion that the cold water of the reservoir of Usina Corumbá I could infiltrate the thermal watertable of Caldas Novas and Rio Quente has no basis, since the waters of the lake are at an elevation of 595 meters, well below the source of the water, at 644 meters. The municipality contains part of the
Caldas Novas State Park which protects the Serra de Caldas plateau region that is the main source of water for the geothermal aquifers of the region. Ecotourism is also present at Caldas Novas as the city is located near the
Corumbá River and the Caldas Novas State Park. In the surrounding area there is a lake - Lago de Piratininga - with boiling water; a reservoir called
Lago de Corumbá with 64 square kilometers damming the Corumbá; and another river - the Rio Quente - which has natural warm water. ==Rio Quente==