The Rio Areias is a significant stream flowing through the heart of Goiás state in central Brazil. As part of the expansive Paraná River watershed, it originates in the Serra dos Pirineus region and travels approximately sixty miles before its confluence with the Corumbá River. The river's course passes through several municipalities, including Corumbá de Goiás, Cocalzinho, Águas Lindas, Santo Antônio do Descoberto, and Alexânia. Historically, its waters were heavily utilized for sand dredging to supply construction materials for Brasília, an activity that has impacted its natural flow and aquatic habitats. The riparian zones along the riverbanks were originally composed of native woods, and while some well-preserved vegetation remains, significant stretches have been converted to agricultural farms and pastures.