The Río Tordillo is a stream located in the Mendoza province of Argentina, flowing in the vicinity of Valle Hermoso and Laguna del Valle. Access to the river is gained via Provincial Route 222, from which a track leads directly to the watercourse. The river's character is defined by its connection to the surrounding high-altitude lagoons and valleys, creating a remote and natural setting. Its flow has been subject to significant human intervention in the past, with one documented incident causing a reduction of up to 60% of its normal flow for a period of five to six days, which caused considerable stress to its ecosystem; however, its natural course has since been restored. This history highlights the river's sensitivity and the importance of its ecological balance. The area is primarily noted for fishing, with resources detailing fishing access points, though specific facilities, amenities, or regulations pertaining directly to paddling are not detailed. The landscape offers scenic views of the Andean foothills and the associated Laguna Valle Hermoso.