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The Donauinsel (Danube Island) is a 21 km artificial island created in the 1970s–1980s as a flood defence. Today it's Vienna's summer playground—swimming, cycling, barbecuing, and home to the annual Donauinselfest, Europe's largest open-air music festival.
The island was engineered between 1972 and 1988 alongside the Neue Donau (New Danube), a parallel flood channel. Together they protect Vienna from once-in-a-century Danube floods.