Lac Blanc from La Flégère: a balcony above the Chamonix valley

The lake is across the valley from Mont Blanc

Lac Blanc sits at 2,352 metres in the Aiguilles Rouges, above the opposite side of the Chamonix valley from Mont Blanc. That position explains the famous panorama: the mountains across the valley are the view, while the walk itself takes place within the reserve. Route source

The lift-assisted approach starts at the upper La Flégère station, around 1,877 metres. Chamonix’s official route listing gives seven kilometres return, about 500 metres of climbing and roughly three hours, with its uphill description allowing around one hour forty-five minutes. Treat those as planning estimates rather than a deadline. Route source

Through the Combe de la Chavanne

The path first drops into the Combe de la Chavanne, then climbs past the old stables, chalets and Lac de la Flégère. It continues below Tête du Aubuy and meets the approach coming from Argentière before reaching Lac Blanc. The initial descent is a useful reminder that a lift-assisted walk still has changes of level to regain. Route source

Using the gondola removes a substantial valley-side ascent, but ties the return to an operating lift. The end of the walking route is the upper station; the end of the transport day is back in Les Praz. Keep those as separate appointments.

A refuge beside a protected lake

The refuge beside the lake offers food and drink to day visitors during its season. Its published 2026 dates run from 5 June to 1 November. That is the operator’s season, not evidence that snow, a lift or every approach will cooperate on a particular day. Route source

Swimming is prohibited at Lac Blanc and the Chéserys lakes, and pets are not allowed on this walk in the reserve. The refuge also prohibits camping or bivouacking at Lac Blanc. Its information points would-be bivouackers toward the separately regulated Chéserys area and its reservation system. Route source Route source

Choose the descent before leaving the lake

A return by the Chéserys lakes offers another sequence of views, but changes the itinerary from the basic out-and-back. Do not attach the seven-kilometre figure to every possible lake combination. Work from the official route description and the actual lift timetable, particularly near either edge of the summer season. Route source