Wachau is one of Austira's most established and notable wine regions, specializing in dry wines made from Riesling and Grüner Veltliner. Located in lower Austria along the Danube River, it is one of the western-most wine producing regions in Austria. Despite its renown, the Wachau is a small wine region that usually accounts for only around 3% of Austria's wine production.While most Austrian winemakers use a clissification system for their wines based on must weight and ripeness (as in Germany), wines from Wachau have a unique classification system. The three classification levels for Wachau wine include Steinfeder for wines up to 11.5% alcohol, Federspiel for wines between 11.5–12.5% and Smaragd that must have a minimum of 12.5% alcohol level.