Ibón de Plan

Ibón de Plan, also known as Basa de la Mora, is a mountain lake set above the village of Plan, in the Gistaín valley, in the Aragonese Pyrenees (province of Huesca). Unlike many alpine lakes, it has no permanent river feeding it — its water comes purely from melting snow and ice at altitude, making it a classic example of a high-mountain glacial pool.

Where is Ibón de Plan located?

The lake sits at roughly 1,910 metres above sea level, inside a rocky glacial basin ringed by steep slopes and patches of conifer forest that reach almost to the shoreline. That combination — a bare, stony amphitheatre softened by dark green pine — is typical of the upper reaches of the Gistaín valley, a side valley of the Aragonese Pyrenees. The village of Plan, which gives the lake its name, lies further down the same valley and serves as the natural starting reference for anyone locating the spot on a map.

How do you get there?

Reaching Ibón de Plan means a genuine mountain hike, not a roadside stop. A car can only take you as far as the lower valley; the final stretch has to be covered on foot along a trail that climbs steadily toward the lake basin. The path shifts character as it rises — starting among trees lower down and opening into bare, rocky alpine terrain closer to the lake. Because of the altitude and terrain, it's worth setting off with plenty of time in hand and checking the weather forecast beforehand, since conditions in the high Pyrenees can shift quickly even in summer.

What will you see at the lake?

The defining feature of this spot is the contrast between the raw, rocky basin and the calm surface of the water, which mirrors the surrounding slopes and sky. With no river inflow, the lake's level and appearance are tied closely to the season — spring and early summer bring meltwater from the surrounding snowfields, which shapes both the water level and the look of the shoreline. The conifers growing around the basin frame the view of the water and the ridgeline beyond, a scene characteristic of high-altitude lakes across this stretch of the Pyrenees.

When is the best time to visit?

Late spring through summer is the most accessible window, once the approach trail clears of snow and temperatures in the upper valley become more hiker-friendly. Earlier in spring, snow can still linger around the basin, making the final approach harder going. Autumn tends to be a quieter time for a hike here, though weather becomes less predictable as temperatures drop.

Frequently Asked Questions

Is Ibón de Plan a natural lake? Yes, it's a natural high-mountain lake sitting in a glacial basin, fed entirely by melting snow and ice with no permanent river inflow.

How high up is the lake? Ibón de Plan lies at an elevation of about 1,910 metres, in the upper part of the Gistaín valley.

Can you drive right up to the lake? No — the final section has to be walked, since the lake sits in mountain terrain that vehicles cannot reach.

Which region of Spain is Plan and its nearby lake in? Plan and Ibón de Plan are located in the province of Huesca, in the Aragonese Pyrenees, within the Gistaín valley.