Things to Do at Mer de Glace

The Mer de Glace (Sea of Ice) is France's largest glacier and one of the most spectacular natural attractions in the French Alps. Located in the Chamonix Valley at an altitude of 1,913 meters, this 7-kilometer-long glacier flows down from the north face of Mont Blanc, creating a frozen river of ice that has captivated visitors for centuries. The glacier moves approximately 90 meters per year, constantly reshaping the landscape and creating dramatic crevasses and ice formations. Accessible via the historic Montenvers Railway, which has been operating since 1909, the Mer de Glace offers visitors an unforgettable journey into the heart of the Alps. The site features an ice cave carved annually into the glacier, a glaciology museum, and stunning panoramic viewpoints. However, like many glaciers worldwide, the Mer de Glace has been significantly affected by climate change, retreating dramatically over the past century, making it not only a natural wonder but also an important testament to our changing climate.

The Mer de Glace is accessible only via the Montenvers Railway from Chamonix. The train station is located a 10-minute walk from Chamonix's town center, near the SNCF train station. The cogwheel railway departs every 20 minutes during peak season and takes 20 minutes to reach the summit. From the Montenvers station, it's a short walk to the viewing platforms, and the ice cave requires an additional 10-minute descent via cable car and stairs (480 steps total). Free parking is available at the base station, though spaces fill quickly during summer.