Ibón de Cregüeña

Ibón de Cregüeña is a glacial mountain lake near Benasque, in the Aragonese Pyrenees. Sitting at roughly 2,630 m above sea level on the southern slope of the Maladeta massif, within the Posets-Maladeta Natural Park, it is described in available sources as the largest glacial lake in Spain — around 1,500 m long, up to 500 m wide, covering about 43 hectares, with a depth reaching 97 m.

How do you get there?

The most common approach starts at the Refugio de la Renclusa, from where a trail follows the Cregüeña valley all the way up to the lake. An alternative route begins at the Paso Nuevo reservoir, joining the path toward the Vallibierna valley before climbing through the Cregüeña ravine to reach the same destination. Either way, this is a demanding hike: the round trip typically takes 5.5 to 6.5 hours, with substantial elevation gain along rocky, high-mountain terrain. It ranks among the tougher day hikes in the Benasque valley, so an early start, proper trekking boots, and a check of the mountain weather forecast are all worth planning for — conditions in this part of the Pyrenees can shift quickly.

What will you see?

What stands out first is the sheer size of the lake — this isn't a small tarn but a wide sheet of water framed by bare rocky slopes and peaks rising above 3,000 m. The Maladeta massif looms over the basin, one of the most recognizable ranges in this stretch of the Pyrenees. The surrounding area is one of the few places left in southern Europe where active glaciers still persist, with the Maladeta-Aneto glacial complex ranking among the most extensive in the entire range. The result is a landscape that mixes high-mountain starkness with the blue-green tone of the water, set against grey rock and patches of snow that linger on the slopes for much of the year.

When should you visit?

Given the altitude and terrain, the route is really only fully accessible in summer, from July to September, once most of the snow has melted and the path is passable without winter gear. Outside that window, snow patches can remain on the slopes, sharply raising both the difficulty and the risk of the hike. Aim for a clear-weather day — under cloud cover, the panorama of peaks ringing the lake loses much of its impact, and navigating the terrain becomes noticeably harder.

Frequently Asked Questions

Is the hike to Ibón de Cregüeña difficult? Yes — it's considered one of the more demanding routes in the Benasque valley, due to the distance, the substantial elevation gain, and the rocky high-mountain terrain on the final stretch of the approach.

How long does the hike take? Depending on fitness level and the route chosen, the round trip usually takes between 5.5 and 6.5 hours.

Is it really the largest glacial lake in Spain? Available sources indicate yes — Ibón de Cregüeña is cited as the country's largest glacial lake (ibón) by surface area.

What's the best starting point? Two options are most common: starting from the Refugio de la Renclusa and following the Cregüeña valley, or starting from the Paso Nuevo reservoir via the Vallibierna valley.