Alsace is the smallest French Region for its surface and one of the most important for its wealth and its population density. " Vosges's " clump, which isolates it from France, was more a springboard than an obstacle in the development of economic activities, today concentrated in Rhenish. The European construction believes in this moment the conditions of the most harmonious proof of this natural way crossing. The physical geography and the humanized landscapes contribute to the Alsace identity variety. Limited eastern by the Rhine and western by the Vosges's wooded clump, the ditch of Rhenish's collapse establishes the skeleton of the region.