Rio das Almas is a stream flowing through the state of Goiás, Brazil, draining into the upper Rio Tocantins basin. Stretching approximately 58 kilometers, the river winds through a region shaped by the Brazilian Cerrado landscape, receiving waters from two tributaries and distributing flow through two distributaries, including Córrego Ave Maria. The river corridor reflects the broader ecological character of the upper Tocantins watershed — a biologically rich system that supports a remarkable diversity of native fish species across multiple orders and families. The watershed has experienced significant pressure from agricultural expansion, dam construction, mining activity, and the introduction of exotic species, making it both a productive and ecologically sensitive fishing destination.