Wien River

The Wien is a 34 km long river that flows through Vienna, Austria, with 15 km within the city limits. Its drainage basin covers 221 km2, and it flows into the Donaukanal, a branch of the Danube. The river's flow can vary greatly due to heavy rain and snowmelt, and its bed is mostly concrete within the city, built to prevent flooding and cholera outbreaks. The river passes through several notable areas, including the Naschmarkt and Theater an der Wien, and is partially covered over in the city. A River Gate was built in 1906, and plans are underway to build three terraces along the river valley. Cycling and walking paths are prohibited in the river bed, but a short segment was opened in 2005 with a warning system for flooding.learn more on wikipedia