| Riedau | |
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Riedau
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| Country | Austria |
| State | Upper Austria |
| District | Schärding |
| Mayor | Berta Scheuringer (ÖVP) |
| Area | 8 km2 (3 sq mi) |
| Elevation | 376 m (1234 ft) |
| Population | 1,963 (1 January 2011)[1] |
| - Density | 245 /km2 (636 /sq mi) |
| Time zone | CET/CEST (UTC+1/+2) |
| Licence plate | SD |
| Postal code | 4752 |
| Area code | 07764 |
| Website | www.riedau.at |
Riedau is a municipality in the district of Schärding in Upper Austria, Austria.