The Río Rahue originates at the western end of Lago Rupanco at an elevation of 141 meters and flows approximately 120 kilometers before emptying into the Río Bueno, roughly 40 kilometers inland from the Pacific Ocean. In its middle course, the river passes through the city of Osorno in a north-south direction, making it one of the more accessible rivers in the Los Lagos Region for urban-based paddlers.

Organized kayak descents of the Río Rahue operate out of Osorno, with both the Municipalidad de Osorno and the local outfitter Indómito Kayak running guided trips on the river. The Municipalidad has offered scheduled descents on specific dates, with registration handled through the Departamento de Turismo at Calle Bilbao 850, fifth floor, Osorno. These organized trips suggest the river is suitable for paddlers beyond expert level, though specific difficulty ratings have not been established here.

The river corridor is noted for bird watching and passes through landscapes with native forest and abundant wildlife. The Rahue holds considerable cultural significance as a historical travel route used by Mapuche people long before roads existed in the region, and this heritage is part of the experience offered by local operators.

Given the technical details around hazards, access points, water levels, and seasonal conditions, paddlers planning independent trips should contact local operators such as Indómito Kayak or the Osorno tourism office directly before putting in.