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Switzerland lies at the center of western Europe geographically, but outside it politically. Sometimes called Europe's water tower, it is the source of all four of the region's major river systems: the Po, the Rhône, the Rhine, and the Inn–Danube. Switzerland has built one of the world's most prosperous economies, aided by the fact that it has retained its neutral status through every major European conflict since 1815. The process of European integration has been the latest and strongest challenge to Swiss neutralism, but it remains outside the EU.