Aneto and Forau de Aigualluts

Waters of Aneto

Aguas del Aneto is a journey through the scars left by water in the heart of the Pyrenees. Here, the landscape is not static; it is the result of thousands of years of erosion on the purest granite in the mountain range.

THE GREATEST MYSTERY OF THE PYRENEES

WATERS OF ANETO

Stop being a visitor and become a tracker of an invisible river, challenging the verticality of the granite to discover the best-kept secret of the Maladeta.

On this circular route, you will walk across the mirror-like surface of mountain lakes, cross ravines roaring with meltwater, and skirt the last glaciers in southern Europe. But the real secret awaits you in Forau de Aigualluts: the greatest mystery of the Pyrenees, where the waters of Aneto disappear spectacularly to travel through hidden tunnels and reappear in Uelhs deth Joèu, in the Aran Valley.

This is the point where water becomes the invisible thread that links the Renclusa, Conangles, and Llauset refuges. This is a journey for mountaineers seeking the essence: bare rock, open skies, and the sound of water reminding you that, in the Kingdom of Aneto, nothing stays the same, but everything is eternal.

MORE THAN AN EXPERIENCE

More than just walking, you embark on a unique experience that begins long before you take your first step on the mountain.

Safety at every step

You will feel safe thanks to the latest technology in real-time monitoring, which allows us to intervene quickly if something does not go according to plan.

LEARNING AT EVERY STEP

Learn and evolve as a mountaineer with the videos and trainings we offer you, improving your skills to enjoy every mountain adventure to the fullest.

DISCOVER OUR ROUTES

SELF-GUIDED

525,00 €

WATERS OF ANETO

THE CLASSIC

  • 5 stages
  • 76.33 km
  • +5,974 m/-5,877 m
  • Physical Difficulty: High
  • Technical Difficulty: High

Master the eternal water cycle on this 5-stage journey through the heart of the Kingdom of Aneto. An endurance challenge with over 5,000 meters of elevation gain that connects the history of La Renclusa with the modernity of Llauset. You will conquer legendary passes such as the Collado de Mulleres (2,928 m), following the trail of water from its disappearance in Aigualluts to its reappearance in the Aran Valley.

460,00 €

WATERS OF ANETO

Pioneers

  • 4 stages
  • 57.2 km
  • +4,594 m/-4,594 m
  • Physical Difficulty: High
  • Technical Difficulty: High

Designed by a park ranger and a guide, this four-day route connects the most authentic corners of the Maladeta massif. It is an itinerary with character that follows in the historical footsteps of the first explorers and captures the spirit of the high mountains. A journey designed "from within" for those seeking the pure essence of each mountain lake and each summit.

THE GREATEST MYSTERY OF THE PYRENEES

FOLLOW THE TRAIL!

What do routers say about their experience with Alta Ruta?

YOUR EXPERIENCES

Published on Google Google
Ernesto Ginel's profile picture
Ernesto Ginel
Google Star 1Google Star 2Google Star 3Google Star 4Google Star 5Trustindex verifies that the original source of the review is Google.
The route was a great experience, and the excellent organization behind it—especially with the self-guided option—gives you the peace of mind you need to focus solely on enjoying the mountains. You don’t have to worry about booking mountain huts, maps, GPS tracks, hazardous areas, etc.—you can just enjoy yourself, knowing that if any problems arise along the way, they’ll be there to help. It’s been fantastic to discover these areas of the Pyrenees (Los Perdidos and Moliere-Besiberris) with them and in this way.
Published on Google Google
Anthony Grumbach's profile picture
Anthony Grumbach
Google Star 1Google Star 2Google Star 3Google Star 4Google Star 5Trustindex verifies that the original source of the review is Google.
Patricia and her team at La Alta Ruta were wonderful to work with. They helped us plan and book a customized 9-day trek along La Alta Ruta de Los Perdidos, made the refuge reservations, assisted us with transportation to and from Bujarueles, and provided accurate information and GPX tracks for the trail. They were responsive, knowledgeable, and reliable. The background essays they shared in weekly emails before the trip deepened our appreciation of the route’s geology, history, and culture. With their GPX files, paper map, and brief orientation meeting, we completed the route on our own, never needing to contact them during our trek—though we were reassured to know we could reach out if we needed help during an emergency in a foreign country. We’ve planned many of our own backpacking routes, but it was helpful and important to have their experienced guidance regarding what was unfamiliar, foreign territory for us. There are trail junctions with alternative routes that present different challenges, levels of exposure, or views. And while we were often on clearly defined and well-maintained trails, at other times the trails were more primitive—somewhat like being on a well-established cross-country route in the U.S. wilderness but with trail markers and more cairns. The Alta Ruta de Los Perdidos is as beautiful and challenging as described in other online trip reports and reviews. We are experienced backpackers in our 60s who are in good physical condition but are not competitive athletes. On our 9-day itinerary in early September 2026, many days were pleasantly long and tiring, but we built in some easier days that gave us time to take a break from the bustling refugios at a hotel in Gavarnie, climb a peak, take a day hike on a side trail, or simply savor a fantastic view and a beer at a picnic table outside a refugio. We found the refugios to be a fun contrast to our usual, much more isolated backpacking at home. We made a lot of new friends from Spain and other countries. We still had plenty of peaceful time in the mountains to ourselves during our days on the generally uncrowded trails. There was drinking water at every mountain hut. But because these trails have been used by sheep and cattle herds for centuries, when we refilled our bottles from streams or springs during the day, we both filtered and treated the water, as La Alta Ruta advised. I highly recommend this route and working with La Alta Ruta to plan a self-guided trip. And judging by the very happy hikers we dined with one night—who were with one of La Alta Ruta’s local guides—I’d also recommend their guided tours if that’s your preference.
Published on Google Google
Eva Rodriguez's profile picture
Eva Rodriguez
Google Star 1Google Star 2Google Star 3Google Star 4Google Star 5Trustindex verifies that the original source of the review is Google.
Everything was great; our guide, Toño, was very helpful throughout and very knowledgeable. I really enjoyed both the guide and the rest of the group. I'll be back next summer to do the entire Alta Ruta.
Published on Google Google
Julen Legorburu's profile picture
Julen Legorburu
Google Star 1Google Star 2Google Star 3Google Star 4Google Star 5Trustindex verifies that the original source of the review is Google.
A wonderful experience on a beautiful route, very well organized
Published on Google Google
Patxi's profile picture
Patxi
Google Star 1Google Star 2Google Star 3Google Star 4Google Star 5Trustindex verifies that the original source of the review is Google.
At the end of August, six of us completed the Monte Perdido Tour, including the ascent of Monte Perdido. A wonderful experience and extremely professional organization!!!!
Published on Google Google
Jaume Julibert's profile picture
Jaume Julibert
Google Star 1Google Star 2Google Star 3Google Star 4Google Star 5Trustindex verifies that the original source of the review is Google.
In my case, the Alta Ruta de Molieres y Besiberris. A demanding route with technical sections that aren’t suitable for everyone. Top-notch organization: briefing, GPS tracking in case of any serious mishap or emergency, comprehensive information in the days leading up to the trip, daily monitoring, a phone line that answers any issues, alternative routes in case of bad weather, and services included at every overnight stop (mountain hut or hotel—and by the way, it’s a great idea to spend two nights in hotels); in other words, they take care of everything, and all you have to do is focus on the hike and enjoy “paradise.” A very secluded but incredibly beautiful route, covering three 3,000-meter peaks, with options to tackle a couple more along the same route. I’d do it again in a heartbeat!!! Thank you so much for everything!!!!
Published on Google Google
Manuel Riveiro's profile picture
Manuel Riveiro
Google Star 1Google Star 2Google Star 3Google Star 4Google Star 5Trustindex verifies that the original source of the review is Google.
A fantastic route—a hike to enjoy and have a wonderful experience