The Bossons Glacier is one of the larger glaciers of the Mont Blanc massif of the Alps, found in the Chamonix valley of Haute-Savoie département, south-eastern France. It is fed from icefields lying on the northern side of Mont Blanc, and descends down close to the Aiguille du Midi and ends on the southern side of the Arve valley, close to the town of Chamonix. It has the largest altitudinal drop of all the alpine glaciers in Europe, and formerly extended much further down the valley than it does today. It is now approximately 7.5 km long, with a surface area of approximately 10 kmm².
In the 17th century the Bossons glacier extended right down into Chamonix, reaching the settlement of Le Fouly, engulfing farmland, barns and houses. Local bishops were called upon to exorcise the demons within the glacier. By around 1784 the glacier had started to retreat, although there was a renewed surge around 1815 and the frightened community erected a cross in front of its snout, which served as a marker for glacial retreat for the next 100 years.
In 1900 the snout of the glacier was still reaching down into the valley bottom at an altitude of 1,050 metres above sea level. By 1980 the snout only reached down to about 1,200 metres, and by 2008 it had melted backwards even further backwards, ended at around 1,400 metres, albeit still well below the treeline. A series of paintings from the early 19th century and modern day photographs reveal the extent of the glacier's recession as the climate has warmed, as well as revealing evidence of glacial moraines showing its past extent down to the valley bottom.
- "A little background". montblanc.to. Retrieved 29 January 2016.
- "Glacier des Bossons and Glacier de Taconnaz". www.swisseduc.ch. Retrieved 29 January 2016.
- "Le Glacier des Bossons, autrefois". www.glaciers-climat.fr. Retrieved 29 January 2016.
- "Le Glacier des Bossons 2/ Aujourd'hui.". www.glaciers-climat.fr. Retrieved 29 January 2016.
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