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Mer de glace: the largest glacier in France is 7km long and covers 40 square km. It is also several hundred meters thick. Its thickness varies with the year and the month in the year; in the 2000s it started melting and its level has been decreasing by several meters every year - a phenomenon attributed to "global warming". In 1900 the level of the glacier was at par with the Montenvers hotel and train station.