German for 'large area', consisting of various single vineyards (Einzellagen).
Wine with a Grosslage appellation can be made from any grapes within that Grosslage, often resulting in fairly bland wine. The term was established in Germany's wine law of 1971 and has been much debated ever since, because the deceptive naming of some mediocre Grosslagen (e.g. the Grosslage "Piesporter Michelsberg" can easily be mistaken as a superior single vineyard site such as "Piesporter Goldtröpfchen" by consumers.