Lac de Lona

Lac de Lona is a high-alpine lake at 2,640 m above sea level, set above Grimentz in the municipality of Anniviers, canton of Valais, Switzerland. It lies in the Lona basin beneath the Pas de Lona pass and rewards hikers who climb out of the Val d'Anniviers.

Where is Lac de Lona?

The lake sits above the village of Grimentz, on a side branch of the Val d'Anniviers. The Lona basin is a mix of scree slopes and several smaller ponds. An active rock glacier descending from the Sasseneire massif feeds into the lake, which gives the setting a raw, post-glacial feel. Higher up, at roughly 2,788 m, runs the Pas de Lona.

How do you get to Lac de Lona?

Grimentz is the usual starting point. A cable car carries you up to Bendolla, and from there a trail heads towards the lake. If you prefer to walk the whole way, the zigzag path from Grimentz to Bendolla takes about an hour and a half. Beyond that you follow Switzerland's Alpine Passes Trail (route 6): it passes the lake, climbs over the Pas de Lona and continues to the Cabane des Becs de Bosson, just under 3,000 m. It is the highest SAC hut on this route.

Which route should you pick?

A classic full-day outing links Bendolla, the lake and the Moiry dam. It covers about 14.8 km in around 6 hours with 1,034 m of ascent. On the way you pass the Sex de Marinda viewpoint (2,906 m) before dropping to the dam. For something shorter, walk only as far as the lake and return the same way.

When should you go?

At this altitude the trails are clear of snow mainly in summer and early autumn. Start early and pack warm layers, a rain jacket and plenty of water. Above 2,500 m the weather turns quickly and cloud often rolls into the basin. Check the mountain forecast and the cable car timetable before setting out.

What else is nearby?

Grimentz is known for the dark timber houses of its old village centre. The Moiry dam is close by, with its turquoise reservoir and a glacier as backdrop. The Lona basin and surrounding ridges open up views over the peaks of the Val d'Anniviers.

Frequently asked questions

How high is Lac de Lona?

It lies at 2,640 m above sea level, above Grimentz in Valais.

Where is the easiest place to start?

Grimentz. The Bendolla cable car shortens the climb, and from there you follow the Alpine Passes Trail.

How long is the hike to the Moiry dam?

The route from Bendolla past the lake to the dam is about 14.8 km and takes around 6 hours.

Is there a mountain hut nearby?

Yes, the Cabane des Becs de Bosson, just below 3,000 m, beyond the Pas de Lona.