The Donauinsel is Vienna’s own thing: 21.1 km long, 70-210 meters wide, artificially built between 1972 and 1988 as flood protection. What began as an engineering project is now the city’s swimming, running, grilling and festival ground - and one of the few places where you can leave the city completely behind while standing right in the middle of it. Between the island and the city bank runs the Neue Donau, a calm side arm with no ship traffic; the main river flows on the other side.
For visitors, the island is interesting because it shows a Vienna that appears in no palace brochure: the city at the water, barefoot in summer, with mosquitoes in the evening and gelato in the afternoon. If you’re in Vienna in July or August and wonder where the locals disappear to - here.
Swimming
Free and open access. The official bathing spots have lawns, snack stands, toilets, some nudist sections. Water quality is monitored continuously and has been reliably good for years - on a good day the Neue Donau feels almost like a swimming lake. Highlights: Strandbar Herrmann (at the Danube Canal entrance), Toter Grund (middle section, quieter), Copa Cagrana (southern entrance, with restaurants).
Rough guidance for picking your stretch: the area around the U1 station Donauinsel is the busiest - restaurants, music, people. The further north or south you walk, the emptier it gets. After twenty minutes on foot you almost always have a lawn to yourself.
Cycling and skating
Asphalt cycle path along the full length, both sides, plus an inline skating course. Bike rental stations at several Wiener Linien stops. The whole island and back: about 45 km. More realistic for half a day: one half of the island plus a cross-Danube metro hop back.
The island is pancake-flat, car-free and almost free of crossings - which makes it the easiest cycling route in the city, including for kids and for anyone who doesn’t ride much otherwise. Runners use the same paths; the kilometer markers along the way help with pacing.
Events
Donauinselfest on the last weekend of June: Europe’s largest open-air festival, three days, free. 2.5 to 3 million visitors across the three days. If you’re after quiet, stay away - but if you happen to be in Vienna anyway, drop by for at least one evening, if only for the sheer scale.
Swimming races, beach volleyball tournaments, pop-up concerts all year round. Dates on the City of Vienna website.
Getting there by public transport
Metro stations directly on the island: Donauinsel (U1), Neue Donau (U6). From Stephansplatz on the U1 it’s about 12 minutes - no other European capital gets you from cathedral to beach faster. Coming from the 1st district you can also take the U2 to Donaumarina and walk a short stretch. Both metro entrances sit in the busiest part of the island; for quieter sections, plan another 15 to 30 minutes on foot from the station or bring a bike (allowed on the metro outside rush hours).
With kids
Playgrounds along the island, shallow water entries on the Neue Donau side. Toilets at regular intervals. In summer there are lifeguards at the big beaches, but not along the full length. The island’s water playground is a reliable afternoon-filler on hot days. For families who want to base their whole Vienna stay near the water: in Leopoldstadt you stay between the Prater and the Danube, and we’ve sorted our family-friendly hotels separately.
Best time for the island
Swimming season runs roughly May to September, with peak crowds above 30 degrees. June before the festival and September are the most relaxed swimming weeks. Outside summer the island stays a running and cycling territory - with fog hanging over the water in autumn and near-total emptiness in winter. For sunset, head to the eastern bank facing the main river: low light, the Danube City skyline across the water.
What to bring
- Water and drinks (not every stretch has a stand).
- Your own towel and sandals.
- Sunscreen: very little shade.
- Mosquito repellent for the evening; the water has its price.
- In summer a few rubbish bags, the official bins are often full.
If you want water close to the center: Strandbar Herrmann on the Danube Canal (not the Donauinsel, but closer to town) is the shortest hop from the 1st district: a 15-minute walk. And if you’d rather swim in a proper lido than in the river, the Alte Donau - the still old arm one metro stop further - has Vienna’s traditional bathing establishments with jetties and boat rentals.
Donauinsel or Alte Donau?
The short version: the Donauinsel is free, vast and wild - come here for long bike rides, open swimming and barbecue evenings. The Alte Donau is the tamed old river arm with lidos, pedal boats and lakeside restaurants - better for a classic beach day with infrastructure. You reach both on the same U1, so the decision can wait until the morning of. More outdoor ideas in our overview of sights.
Frequently asked questions
Does the Donauinsel charge admission? No, the entire island is freely accessible, including the bathing areas. Only bike rentals, restaurants and some sports facilities cost money.
Can you really swim in the Danube? In the Neue Donau, yes - it’s separated from the main river and continuously monitored. Swimming in the main stream itself is a bad idea because of currents and ship traffic.
How much time should I plan? Two or three hours with a waterfront walk and a stop at a bar give you a real impression. A swimming day or a bike tour comfortably fills half a day to a full one.
Is the island worth it in cool weather? Yes - then it belongs to the runners and cyclists. Water views, space and quiet work in October too; only the beach bars will be closed.