Mer de Glace Glacier & Montenvers Railway
The Mer de Glace — 'Sea of Ice' — is France's largest glacier, a slow-moving river of blue-white ice that stretches seven kilometres through the heart of the Mont Blanc massif. The vintage red Montenvers rack-and-pinion railway has been hauling awestruck visitors up to its edge since 1909, and the journey itself is half the joy.
The Glacier Experience
From Montenvers station at 1,913 m, a gondola drops you to the glacier's surface, where a carved ice cave system — re-excavated every year as the ice retreats — lets you walk inside the glacier itself, past sculpted blue chambers and frozen waterfalls.
The retreat of the Mer de Glace is one of the most visible signs of climate change in the Alps: markers on the cliff show where the ice surface stood in 1820, 1900 and each decade since, a sobering and thought-provoking display.
Back at the station, the Refuge du Montenvers serves warming tartiflette and vin chaud on a terrace with a front-row glacier view — one of the finest lunch spots in the valley.
Getting There & Hiking Down
The Montenvers train departs from a dedicated station just east of Chamonix centre, with trains running roughly every 20–30 minutes in high season. The round trip takes about two hours minimum, more if you descend into the ice cave.
Strong walkers can hike back down to Chamonix on the well-marked trail through the forest in about 1.5 hours — a satisfying loop that avoids the return train fare and delivers you straight into town.
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