Region of Urubici, SC, Brazil. Location of the furthest upstream sources of the Uruguay River, where it is possible to observe the morphology of volcanic rocks (Serra Geral Aquifer System). Just below, the escarpment consisting of Botucatu Sandstone (Guarani Aquifer System) stands out, forming what we call the Integrated Guarani/Serra Geral Aquifer System (SAIG/SG). Considering a proposal for integrated management of surface and groundwater, this system establishes itself as the main source of groundwater for the western regions of the states of Santa Catarina and Paraná, as well as the north-northwest of Rio Grande do Sul.
(Photo: Carlos Henrique Fensterseiffer)