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Stand at the edge of Lake Constance and you can see three countries at once . Switzerland is to the south . The lake sits between all three . Most lakes have a clear border . Germany , Austria , and Switzerland have never agreed on where their borders meet in the water . This has been true for over one hundred years . Switzerland wants the lake split down the middle . Austria says the main lake belongs to all three countries together . They call this a " condominium . " No agreement has ever been signed . So the lake has no official border . Fishermen from all three countries can fish anywhere on the lake . A joint commission has managed fishing rights for more than a century . A boat can cross from Germany to Switzerland with no border check . Austria joined the Schengen Area in 1997 . After that , passport checks at ferry crossings disappeared . The lake is also a drinking source for around four million people . The three countries work together to keep the water clean . Lake Constance shows something important . Sometimes an open border is not a failure . Sometimes sharing is the better answer .
