Cajón del Achibueno in Linares: the complete travel guide

Less than an hour from the main square of Linares, following route L-45 toward the Andes, the valley narrows and one of the most beautiful landscapes in the Maule Region appears: the Cajón del Achibueno (Achibueno Canyon). Crystal-clear water running between giant boulders, turquoise natural pools, native forest, waterfalls and, at the very top, glaciers and a glacial lake at the foot of the Nevado de Longaví volcano. For many locals it is the summer outing par excellence; for visitors from elsewhere it is still a well-kept secret.

In this travel guide to the Cajón del Achibueno we bring together everything you need to plan your visit: how to get there from Linares, things to do, its natural wonders, the best-known hiking routes, where to stay and the best time to go. We checked the information in October 2026 against official sources and the area's own tourism operators, but schedules and prices change from season to season, so always confirm them before you travel.

What the Cajón del Achibueno is and why it is a Nature Sanctuary

The Achibueno River is born in Laguna Achibueno, a glacial lake east of the Nevado de Longaví. From there it flows west through a deep mountain valley until it joins the Loncomilla River, of which it is the most important tributary. Along the way it marks the boundary between the municipalities of Linares and Longaví, and near the Pan-American Highway (Route 5) it receives the waters of the Ancoa River. That high, narrow stretch between forest-covered hills is what everyone knows as the Cajón del Achibueno.

In May 2015, Chile's Council of Ministers for Sustainability approved declaring it a Nature Sanctuary (Santuario de la Naturaleza), and the protection was made official by Decree 35 of the Ministry of the Environment, published in December of that year. The sanctuary covers about 4,556 hectares: around 1,929 are riverbed and other bodies of water, 1,388 are glaciers and over 1,200 are forest. It was the first nature sanctuary in central Chile created specifically to protect the entire water network of a river basin: the river, its tributaries, lakes and the glaciers of the upper valley.

Why so much protection? Because the valley is home to a large number of endemic species, both fish and aquatic fauna and plants. Its slopes are covered with roble (southern beech), coigüe, mountain cypress, peumo and ñirre trees, and with a little patience you can spot iconic birds such as the burrowing parrot (loro tricahue) and the Magellanic woodpecker (carpintero negro). For visitors this means something very simple: you are entering a protected area and it must be looked after.

How to get to the Cajón del Achibueno from Linares

Access to the Cajón del Achibueno starts in the city of Linares on route L-45, which heads east toward the foothills. The road is paved up to roughly kilometer 36 and continues as gravel after that. The main landmarks are the Bajo El Nabo area (around km 23, home to Achibueno Lodge), the village of Pejerrey (around km 32, an hour from Linares by car) and Monte Oscuro, about 57 km from the city, where the road ends and the trails to the upper valley begin.

Your own vehicle is the most convenient option, since it lets you move freely between swimming spots and trails. Any car can reach Pejerrey without trouble; on the gravel stretch to Monte Oscuro drive slowly and, if it has rained, a pickup truck is better. Fill up in Linares before heading up, as there are no gas stations in the canyon. You can see where gasoline is cheapest in our fuel price comparison for Linares.

If you don't have a car, rural buses run from Linares to Pejerrey. According to local tourism operators, they leave Monday to Friday at 11:30 and 17:15 and on Saturdays at 14:00, with no service on Sundays. Confirm the schedule before traveling, as it changes in high season. Another option is a tour with transport included, such as those run by Andes Maule Travel, which organizes trips to the Cajón del Achibueno departing from Linares, with a guide and a packed lunch.

Keep in mind that in much of the valley the cell phone signal is weak or nonexistent. Download offline maps before you leave and tell someone your itinerary, especially if you plan to go hiking.

Things to do in the Cajón del Achibueno: river, pools and adventure

The main attraction of the Cajón del Achibueno is the river itself. The water is so clear you can see the bottom several meters down, and along the valley it forms natural pools in shades of green and turquoise, perfect for a swim on hot days. The water comes from snowmelt, so it is cold even in the middle of January: the usual approach is to wade in slowly and then get out quickly to sunbathe on the rocks.

Beyond swimming, the valley offers much more: kayaking and inflatable kayaks (duckies) on the calm stretches, rafting when the river runs higher, horseback rides led by local muleteers (arrieros), birdwatching, landscape photography and, at night, stargazing, since the sky far from the city is spectacular. Several lodgings in the area rent kayaks or arrange horseback rides and excursions.

Recreational fishing is another classic: the river has trout and the season runs roughly from November to May. To fish you need a recreational fishing license, available online from Sernapesca (Chile's fisheries service), and you must follow the catch rules. In a sanctuary, catch-and-release is the recommended practice.

Don't leave without trying the products made by the people of the valley. Local families sell homemade jams, pan amasado (traditional kneaded bread), tortillas al rescoldo (bread baked in embers), dried fruit and handwoven textiles. Buying directly from them is the best way to make sure tourism benefits the community that looks after this place.

Hiking in the Cajón del Achibueno: waterfalls and Laguna Achibueno

For those who love walking, the Cajón del Achibueno is one of the best hiking destinations in the Maule Region. Most routes start from Monte Oscuro and the Las Mulas area, where you must sign in before setting off. No special permit is needed, but registration is mandatory so that someone knows you are on the trail.

Las Ánimas Waterfall. This is the most popular day hike: 8 to 10 km round trip, of medium difficulty, taking about 3 to 4 hours. The trail crosses streams and stretches of native forest before reaching a series of crystal-clear falls that form turquoise pools. Bring sandals or water shoes for the stream crossings, and avoid the area after heavy rain, when the Las Ánimas stream can rise dangerously.

Trek to Laguna Achibueno. This is the valley's great route: about 64 km round trip, usually done in around five days, following the river upstream through forests of coigüe, cypress and ñirre to its source at about 1,790 meters above sea level. Along the way you pass the Los Patos stream, with views of the Nevado de Longaví, the curious Círculo Místico (Mystic Circle) and a large waterfall in the Bajo Las Lástimas area, just before the lake. From the upper camp you can also make a side trip to Laguna Añintunes. There is water along most of the route and places to camp, but no services of any kind, so you must be completely self-sufficient and, ideally, go with someone who knows the route.

If you are looking for something shorter, near Pejerrey there are easy walks such as the Juan Amigo Wetland and the Raudal del Gallo waterfall, and the valley also has the La Mina Waterfall. They are good options with children or for a quiet afternoon after a day at the river.

Where to stay in the Cajón del Achibueno

Although you can go and come back in a day, the Cajón del Achibueno is far more enjoyable if you stay at least one night: you reach the river early, before the day visitors, and the starry night sky alone is worth the trip. There is accommodation for different tastes, most of it run by the owners themselves.

Achibueno Lodge (route L-45 km 22.8, Bajo El Nabo area): apartments and camping with direct river access, a swimming pool, a restaurant serving Chilean food with Maule wines, kayak rental and forest trails. It offers packages combining lodging, meals and a guided hike to the Las Ánimas Waterfall. Bookings: +56 9 7911 7354 or reservas@achibueno.cl.

Agua Piedras (Pejerrey): three equipped cabins for groups of 2 to 6 people, surrounded by native forest and about a ten-minute walk from the river pools, with a hot tub (tinaja), massages and breakfast. WhatsApp: +56 9 8475 7176.

Achibueno Yurt (route L-45 km 32, Pejerrey): two independent yurts, one for 4 people and another for a couple with a small child, each with a private hot tub on the deck and river views. They arrange horseback rides, kayaking and hiking. Phone: +56 9 9865 6416; email: achibuenoyurt@gmail.com.

Along the road there are also rural campsites and family-run cabins owned by local residents, many without a website: in high season you will see their signs along the way. If you prefer to sleep in the city and drive up for the day, browse the hotels and cabins in our Tourism and Lodging in Linares category. In January, February and on long weekends, book ahead, as places fill up fast.

When to visit the Cajón del Achibueno and what to bring

The best time to visit the Cajón del Achibueno is from October to May. December to March is river season: long, hot days and pools perfect for swimming, although it is also busier, especially on weekends. Spring (October and November) brings fuller waterfalls and the forest at its best, but the water is very cold and stream crossings can be harder. Autumn, with the beech trees changing color, is perfect for photography and quiet hiking. In winter, snow and rain make the upper valley hard to reach and some routes become impassable.

What to bring: sunscreen and a hat (the mountain sun burns), swimsuit and towel, water shoes, layered clothing because nights are cold even in summer, insect repellent for horseflies (the famous January coliguachos), a flashlight, cash (not every small business takes cards) and bags to carry all your trash back out. For a multi-day trek, add a water filter or purification tablets, a sleeping bag rated for low temperatures and a first-aid kit.

Tips for visiting the Cajón del Achibueno responsibly

The Cajón del Achibueno is a Nature Sanctuary, and its beauty depends on every visitor doing their part. Take your trash back to Linares, don't light fires outside designated areas (the risk of wildfires is high in summer), don't use soap or shampoo in the river, respect fences and private property, and don't take plants, stones or animals. It is not a place for loud music either: part of the charm is hearing nothing but the water.

Safety matters too. The river can have strong currents, especially in spring and after rain: only swim in calm pools, never alone, and always keep an eye on children. For long routes, check the weather, sign in before setting off and stay with your group. In an emergency, the numbers on our useful information page for Linares —police (Carabineros) 133, fire department 132 and ambulance (SAMU) 131— work from any phone with signal.

In short, the Cajón del Achibueno is the great natural jewel of Linares: a sanctuary of crystal-clear rivers, waterfalls and forests just an hour from the city, with plans for everyone, from a family picnic day to a five-day trek to Laguna Achibueno. If you want to combine it with other outings, check out our guide to tourism in Linares and the Maule Region. And for any questions before you travel, visit the Linares Municipal Tourism Office at O'Higgins 624.