Enjoy a day trip to Chamonix Mont Blanc, Montenvers, and discover the "Ice Sea", Mer de Glace on this guided tour from Geneva. Lunch is included. Cross the Switzerland-France border with an informative guide and marvel at the majesty of the European Alps on this Chamonix and Mont Blanc highest mountain in Europe day trip from Geneva. You'll drive through the Arve Valley to the pretty Alpine town of Chamonix. This magnificent glacier is 4 miles 7kms long and averages just under a mile wide. Surrounded by the impressive summits of Les Drus, Les Grandes Jorasses and Les Grands Charmoz, the Montenvers site is a natural living witness of climate change of our era.