The Río Toltén originates at Lago Villarrica, near the city of Villarrica in the La Araucanía Region, and flows approximately 123 kilometers westward before emptying into the Pacific Ocean near Punta Nilhue, where it reaches a width of roughly 500 meters. Its major tributary is the Río Allipén, and from that confluence the river takes on a braided character. Towns along the route include Villarrica, Pitrufquén, Teodoro Schmidt, and Nueva Toltén.

The river is rated Class II to III and is considered a quality run for beginners developing foundational skills as well as intermediates looking to practice combat rolls. The water runs clear blue and is notably warm during the summer months, with good depth throughout. The river offers at least half a dozen views of Volcán Villarrica along the way, making it a visually engaging paddle. SUP boarding and fishing — particularly for Chinook salmon, rainbow trout, and brown trout — are also common on the water.

The put-in is located at the estuary where Lago Villarrica transitions into the river, just above a bridge, and the beach there provides a good area for pre-trip roll practice. The take-out involves access through a private farm, which requires a fee of approximately 5,000 Chilean pesos. Because the access points are described as complex, the run requires either two vehicles or a shuttle driver with specific local knowledge. Commercial fishing operators in the area have been known to provide shuttle services for around 10,000 pesos. Paddlers should plan logistics carefully given these access considerations.

The river is suitable for learning whitewater fundamentals including eddy catching, ferrying, river communication, scouting, and rolling. The combination of manageable whitewater, clear warm water in summer, and consistent volcano views gives the Toltén a character well suited to skill-building trips rather than technical challenge-seeking.