Obago

A tarn among fifty others

Obago is a high-mountain lake in the westernmost pocket of Catalonia, in the municipality of Naut Aran in the Val d'Aran, the only Aranese-speaking valley in Spain and the one that drains north into France as the Garonne river. It lies at roughly 2,260 m, on the eastern side of the Circo de Colomèrs — a north-facing amphitheatre of glaciated granite where the peaks of Gran Tuc de Colomèrs, Tuc de Ratera, Tuc de Sendrosa and La Creu all crowd the skyline. Walkers on the route describe passing lake after lake here, each a different tone from deep pine-green to almost luminous blue, and Obago is one of them — modest in size, ringed by boulders and black-pine forest below, open and bare above.↗↗

The whole cirque sits inside the Parc Nacional d'Aigüestortes i Estany de Sant Maurici, founded in 1955 and the only national park in Catalonia, a protected high-altitude wilderness of more than 1,400 plant species and emblematic Pyrenean fauna — bearded vultures, capercaillie, brook newts, marmots and wild goats. Obago itself has nothing built at it; it is part of the park's quiet, regulated alpine core.↗

How to reach the lake

All access is by foot, with a useful mountain-taxi shortcut at the start. From Vielha or the resort villages of Naut Aran you drive south-east to Salardù and up a narrow single-track road through the Aiguamòg valley to the parking at Plan des Banhs, beside the Banhs de Tredòs mountain spa, about 8 km above the village. From there shared 4×4 taxis run roughly 5 km further up to the trailhead at the Pònt dera Montanheta, at about 1,980 m. In high season — broadly mid-June to mid-September — this is the standard way in, with the first vehicle leaving around 09:00 and the last returning by 18:30; outside those weeks the road is open and you walk it, adding around two and a half hours each way.↗↗

From the bridge the path climbs through black-pine woodland and over wet meadows on boardwalks toward the Refugi de Colomèrs at 2,135 m — the FEEC hut that sits at the foot of the dammed Lac Major de Colomèrs. Past the refuge the GR-11 traces the upper ring of lakes and Obago is one of the stations, reached after the high water of Estanh Mòrt, Lac des Cabidornats and the Pòrt pass basin.↗↗

The walks that pass it

The standard day is the Colomèrs circuit. The full anti-clockwise loop back to Plan des Banhs runs roughly 19 km with close to 950 m of ascent and a seven- to eight-hour effort, taking in seven or more lakes — Major, Mòrt, Cabidornats, Pòrt, Gelat, Pòdo, Obago, Redon and Long — strung along the rim of the cirque. It is rated hard on the trail apps; the upper stretches are rocky and require steady footing, but the views reward the climb.↗↗↗

A shorter but still substantial option loops Lac Major de Colomèrs, Lac de Ratera and Lac deth Ombrèr from the refuge — about 12.6 km over five hours with the same high peak scenery, often quoted as one of the finest half-days in the Aran. For the lake itself, the most dramatic version is the GR-11 push: leave the shore at the far end of Obago and follow the steep slope climbing to the Port de Ratera, the notch between the Aran valley and Pallars Sobirà. From the pass the trail descends past the Estany de Sant Maurici and the twin spires of Els Encantats, so walkers heading for the Aigüestortes side use this stretch as a natural crossing between two worlds.↗↗

Stronger parties use Obago as one waypoint on the Carros de Foc-style refuge-to-refuge walks: the 15 km haul from Refugi d'Amitges to Refugi de la Restanca joins the GR-11 at the Port de Ratera lake and is a recognised multi-day circuit for people with mountain experience and a booked hut for the night. For through-hikers the lake also appears as a camp stop on stage 23 of the GR-11 trans-Pyrenean trail.↗↗↗

When to go

The window is short. Locals and route reports put the realistic walking season from June through October, when the trails have shaken off the snow and the taxis are running. In late spring the upper cirque can still be snowed under; one May walker on the high Colomèrs routes reported needing microspikes and recommended waiting until the very end of June. Even in midsummer the lake shore is cold at night, and afternoon clouds rolling over the Tucs can wipe out the view in minutes, so early starts matter.↗↗

Before you set off

Plan the day as a real mountain outing, not a lakeside walk. There are no facilities at Obago — bring water or treat it from the streams, pack a proper lunch and eat it on a boulder by the water, and take everything you bring back down. Wear boots with grip, carry a warm layer and a waterproof shell even in July, and check the Pla Alfa fire-risk map and the Agents Rurals channels before any summer start, since high temperatures can restrict access to the national park on short notice.↗↗

Inside the park, camping outside the designated areas is prohibited and so is lighting fires or removing anything — flowers, stones, fauna. The simple rule of the cirque is to stay on the trail, keep noise down (there is far more wildlife to hear than to see) and leave the lakeshore exactly as you found it. For the longer refuges-to-refuges plans, the Refugi de Colomèrs (around 2,135 m) is the place to book a bunk; the walk up takes about two hours from Plan des Banhs, so timing the taxi and the hut together is the logistical heart of any trip that uses Obago.↗↗