The Best Fly Fishing Rivers in Northern Patagonia & the Chilean Lakes Region

A Paisa Expeditions Guide

There’s a reason fly fishermen keep coming back to Patagonia. It’s not just the fish — though the fish are extraordinary. It’s the feeling of standing in water so clear you can count the rocks beneath your boots, surrounded by snow-capped volcanoes and forests that haven’t changed in a thousand years, with a brown trout rising thirty feet in front of you like it has nowhere else to be. That feeling is what we built Paisa Expeditions around.

Northern Patagonia — from Bariloche north — and the Chilean Lakes Region together form one of the most diverse and productive fly fishing destinations on the planet. Here’s an honest look at the rivers that define this fishery — what makes each one special, what to expect, and why they belong on your bucket list.

If there’s one river that put Northern Patagonia on the fly fishing map, it’s the Chimehuin. Running out of Lago Huechulafquen near Junín de los Andes, this is classic big brown trout water — wide, powerful, and full of fish that make you work for every eat. The Chimehuin is known for its gusano hatch, a seasonal event where caterpillars fall from the trees lining the banks and the browns go absolutely haywire on the surface. Timing this hatch is something we plan entire trips around. Outside of the hatch, streamers and large dry flies in the early morning and evening produce consistently.

Best for: Experienced dry fly anglers chasing trophy browns. First-timers who want to understand what the fuss is about.

The Malleo is the Chimehuin’s quieter, more technical neighbor — and in many ways the more rewarding river to fish. It runs through privately managed water that keeps pressure low and fish populations healthy. Wild rainbows and browns hold in the seams and riffles, and the wading is accessible enough that you don’t need to be an expert to get into good position. If you’re new to Patagonia fishing, the Malleo is a perfect introduction. If you’re a seasoned angler, it will still test you.

Best for: Wade fishing, technical dry fly presentations, mixed skill levels.

The Caleufu doesn’t get talked about enough outside of the anglers who’ve fished it — and that’s exactly what makes it special. A tributary of the Collon Cura, it winds through open valley and forested canyon with a range of water types that keep the fishing interesting all day long. Rainbows and browns hold in the riffles and pocket water, and the dry fly fishing during summer can be some of the most consistent in the region. Less traffic, more fish, and the kind of scenery that stops you mid-cast.

Best for: Wade fishing, dry fly enthusiasts, anglers looking to get off the more-traveled water.

For anglers who want to cover water and find fish in numbers, the Collon Cura is the answer. Using Junín de los Andes as a base, this is prime float fishing territory — big freestone water with consistent hatches and browns and rainbows stacked throughout the runs and tailouts. A full day on the Collon Cura covers miles of productive water, finishing with cold beer and stories over an Argentine asado. That’s Patagonia at its best.

Best for: Float fishing, high fish counts, groups with mixed experience levels.

The Limay is big water. Running out of Lago Nahuel Huapi near Bariloche, it’s one of the most iconic rivers in Argentine Patagonia — long, wide, and loaded with large rainbows and browns that use the heavy current to their full advantage once they’re on the line. A full day drifting the Limay covers miles of productive runs with open steppe on one side and Andean peaks on the other. If you want to feel the true scale of Patagonia from a drift boat, this is your river.

Best for: Float fishing, large fish, anglers based out of Bariloche.

The Manso earns a special place in the memory of anyone who’s fished it. Running out of Lago Mascardi south of Bariloche and eventually crossing into Chile, it offers a genuine wilderness experience that’s hard to match anywhere in the region. The river pushes through dense forest and dramatic canyon water, and the browns and rainbows that live in it are strong, wild and largely undisturbed. The Manso fishes best from November through the first couple weeks of January — as the season progresses and flows drop, timing your visit early is the move.

Best for: Wilderness fishing, Bariloche-based anglers, November through early January.

The Traful might be the most visually stunning river in all of Northern Patagonia. Running through a narrow valley flanked by old-growth forest and dramatic cliff faces, it feeds into Lago Traful — one of the clearest bodies of water in South America. The fishing is technical. The browns are large and spooky, and the water clarity means they can see everything. Long leaders, precise casts, and patience are the price of admission — but when it comes together on the Traful, there’s nothing quite like it.

Best for: Technical anglers, sight fishing, wilderness experience without the crowds.

Cross into Chile and the character of the fishing shifts entirely. The Petrohué runs out of Lago Todos los Santos near Puerto Varas beneath the shadow of Volcán Osorno — one of the most visually arresting rivers you’ll ever fish. It produces solid rainbows and browns year-round on chubbies, stimulators and rubber leg patterns, making it one of the most accessible entry points on the Chilean side. From March through April, the Petrohué transforms as Chinook salmon push up on their spawning run — big, hard-running Kings in stunning volcanic scenery worth planning a trip around on its own.

Best for: First time visitors to Chile, year-round trout fishing, Chinook salmon March through April.

The Llanquihue sits just down the road from the Huilo Huilo Biological Reserve near Cochueco — one of the most breathtaking stretches of temperate rainforest in Chile. Dark, tannic water pushing through dense native forest, with wild browns and rainbows holding in runs and pools that feel completely untouched. Pressure here is virtually nonexistent, and the fishing reflects that. From March through April, Chinook salmon push up from the lake system on their spawning run — big, aggressive fish in intimate forest water that represents some of the most exciting fly fishing in all of South America.

Best for: Anglers based near Huilo Huilo, wild fish in remote settings, Chinook salmon March through April.

The Enco connects Lago Panguipulli to Lago Pirehueico — and what it lacks in length it more than makes up for in fish. The lake-to-lake connection creates ideal feeding conditions, and rainbows and browns stack up in numbers that can genuinely surprise you. Like the Llanquihue, the Enco sees a strong March and April Chinook run — powerful fish in a compact, accessible setting that gives anglers a legitimate shot at a trophy salmon on the fly without the logistics of a full remote expedition.

Best for: Panguipulli region exploration, lake-connected river fishing, Chinook salmon March through April.

The Cautín runs through the heart of Chile’s Araucanía region — Mapuche country — and carries the personality of that landscape. Raw, fertile, and largely under the radar compared to the more well-known Patagonian fisheries to the south. Wild browns and rainbows hold throughout the system, the dry fly fishing in summer is as good as anywhere in Chile, and the surrounding cultural landscape — ancient forests, Mapuche communities, volcanic peaks — makes fishing the Cautín feel like more than just a fishing trip.

Best for: Combining culture and fishing, anglers wanting to explore beyond the standard Patagonia circuit.

The Biobío is legendary. The upper river retains its wild character and remains a serious fly fishing destination — cold, clear water out of the Andes holding rainbows and browns that are strong, wild and hard-earned. Getting there takes commitment, but anglers who make the effort find uncrowded water and fish that fight like they mean it. The upper Biobío is one of those places that reminds you why you travel this far in the first place.

Best for: Adventurous anglers, remote fishing, those chasing big wild rainbows.

The Argentine side fishes November through April, with peak season December through March. The gusano hatch on rivers like the Chimehuin runs late November to December — one of the most extraordinary dry fly events in the Southern Hemisphere.

The Chilean rivers run on a different clock. November through the first half of January is the sweet spot for trout — flows are ideal and fish are active before summer heat and lower water set in. For Chinook salmon and migratory fish, March and April is the window on the Petrohué, Llanquihue and Enco. For anglers looking to experience both countries, a trip that opens on the Chilean rivers in November and transitions to Argentina through the heart of summer is one of the most complete Patagonia fishing experiences you can put together.

At Paisa Expeditions we’ve built our entire program around these rivers — putting you in the right place at the right time with the right context to make it unforgettable. Whether you’re after a backcountry camp on a remote Chilean river or a premium lodge experience based out of San Martín de los Andes, we build the trip around your story.

Ready to plan your Patagonia fly fishing adventure? Get in touch with us and let’s start talking.