Auvergne corresponds to the Arvernes's old province, placed in the heart of the Central Clump. The French regional economic organization r added Allie to Puy de Dôme's, Cantal and Haute Loire departments. Delayed its urbanization, this Region is placed in the center of France as what it felt isolated, in the moment of the European unification. The physical geography corresponds to plains delimited by the Allier's course. To both sides wide mountains, eastward up to the Loire waterdivide line, and towards the west up to the borders of high Dordogne. The Auvergne mountains, high volcanic lands, constitute the vertebral column of the Region; Clermont Ferrand's vicinities - extend most than 200 kilometres to beyond Aurillac.