Alte Donau#

Alte Donau (Old Danube), largest left-hand branch of the Danube still in existence after its regulation in 1868-1881 within the Vienna city limits (21st and 22nd districts), now approximately 1.6 km2, elongated lake linked to the Neue Donau (New Danube) via ground water, popular leisure area for Viennese, approximately 10 km of bathing beach, water sports facilities, water park in the west, Danube Park on the southern shore, as well as the largest island ("Gaensehaeufel") with a bathing beach.