The Río Litrán is a 40-kilometer river located in the Departamento Aluminé of Neuquén province, in the Patagonian Andes of Argentina. Its name derives from the Mapudungun word for slate or similar rock. The river originates from multiple streams fed by Andean springs near the border with Chile, at an elevation of approximately 1,350 meters, and flows in a general north-to-south direction before emptying into Lago Aluminé via its northeastern shore, at an elevation of around 1,150 meters — a total descent of roughly 200 meters over its course.

The river flows through a landscape of ancient araucaria trees and large boulders, transitioning near its mouth into an area of pine plantations before reaching Lago Aluminé, close to the tourist town of Villa Pehuenia. The water is transparent, and the surrounding terrain is characterized by Andean cordillera scenery with forests and lakes.

Access along much of the river is facilitated by Ruta Provincial 23, which runs parallel to the river for a significant portion of its length, offering multiple points from which to approach the water. Near the mouth, Ruta Provincial 13 crosses the river, providing an additional access point. The Municipalidad de Villa Pehuenia-Moquehue maintains a designated Mirador Río Litrán, indicating that at least one formal viewpoint exists along the river corridor.

Sport fishing is practiced at the river's mouth, with rainbow trout of small to medium size being the primary catch. Whitewater kayakers have paddled the Río Litrán, with photographs shared within the paddling community depicting kayaking on the river. The combination of rocky riverbed, Andean gradient, and clear water creates a river with character suited to whitewater paddling.

No specific paddling restrictions or regulations have been identified for this river. Paddlers planning a trip should note that the river is relatively compact at 40 kilometers, making it potentially suitable as a multi-day or single-day run depending on water levels and chosen put-in and take-out points along Ruta Provincial 23.