Abstract
The Arcos-Pains Karst Region is approximately 850 km2, formed by massive carbonate rocks that host hundreds of caves, rock shelters and shafts. Many fossil discoveries exist in the region; one can also find rock paintings and other archaeological remains. A ruiniform landscape, weathered caves and continuous or isolated outcrops characterize the karst. They are cut by diaclasis, fractures and fissures, separated by flattened relief with dolines, uvalas, ponors and blind valleys. The evolution of karst morphology in the region reflects pluviometric and paleoclimatic variations, with faults and fractures from neotectonics events exerting control over water flows. One can observe four geomorphological compartments in this region, each with specific characteristics. The region is an outstanding example of the Brazilian intertropical karst and one of the most important Brazilian mineral deposits of limestone and dolomite. So, delimitating its geomorphological units can facilitate understanding the speleological heritage and guide strategic decisions for sustainable use.
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