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A vast volcanic area
The volcanoes of the Monts Dore massif, among which we find Puy de Sancy (photo), emerged on top of the granite and gneissic plateaus of Massif Central, inside a vast ellipse of 21.7 miles (35 km) between Saint-Pierre-Roche and Lake Chauvet on a North-South axis, and 9.9 miles (16 km) between La Bourboule and Murol on the East-West axis. Volcanic materials, projections, and lava flows spread out over an area of approximately 372 sq. miles (600 sq. km).
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