A small tributary feeding the Lácar system near San Martín de los Andes, the Quilquihue is unhurried, volcanic-gravel water that rewards patience rather than distance covered. Runs are short and readable, riffles give way to pools deep enough to hold a resident brown through the heat of summer, and the river fishes well on foot without needing a boat or a long hike. Parachute Adams and Elk Hair Caddis in smaller sizes suit the clear, slower pools, while a Stimulator will still pull fish up in faster water near the head of a run. It's public water with light pressure through most of the season, ideal for an unhurried afternoon between bigger-name rivers, though local knowledge still helps identify which short stretches actually hold fish worth the walk.

• Volcanic glacial