The Miage Glacier is a debris-covered glacier in northwestern Italy. It is situated on the southwest flank of the Mont Blanc massif, flowing from Col de Bionnassay (3,892 m (12,769 ft) above sea level) into Val Veny. At around 10 km (6.2 mi) in length, it is Italy's longest glacier and also the largest debris-covered glacier in Europe.
Approximately 5 km2 (1.9 sq mi) of its total area of ~11 km2 (4.2 sq mi) is covered in debris originating primarily in rockfall from surrounding walls and avalanching in accumulation areas of its four tributaries.Debris carried along within the glacier is also being exposed at increased rates due to accelerating thinning of the glacier tongue.The number of sources of supraglacial debris as well as the unusual, mica schist-dominated lithology of the rock walls surrounding the glacier, makes for a varied debris lithology.
debris cover becomes continuous at ~2,400 m (7,900 ft) above mean sea level (asl) and remains unbroken to the terminus. Patchy areas can occur, however, where crevasses or moulins occur.Debris thickness generally increases from a few centimetres at 2,400 m (7,900 ft) asl to over 1 metre (3 ft 3 in) at the terminus at ~1,775 m (5,823 ft) asl, although the spatial distribution of thicknesses is heterogeneous especially on parts of the northern terminal lobe.