The Donauinsel is a 21 km long and 250 m wide artificial island in Austria that serves as a recreational park. Here, you can hike, swim, cycle, trampoline, climb, eat, drink, and generally enjoy yourself. Each year, for one weekend, about 4.5 km of the island transforms into a massive open-air music festival known as the Donauinselfest (Danube Island Festival).
The Vienna Danube Island Festival, or the Donauinselfest, is a highly popular and widely attended event, particularly in Europe. It attracts millions of visitors over its three-day duration, which makes it one of the biggest music festivals in the world. The 42nd Donauinselfest in Vienna, Austria, will be held from June 20 to 22, 2025. The line-up for the festival is still under development, with details to be released later.