What does the term "Grosslage" refer to in the context of German wine?

The term "Grosslage" in the context of German wine refers to a group of vineyards. Specifically, it is a larger geographical designation that can encompass several smaller vineyard sites, known as "Einzellagen." Grosslagen are often used in the classification of wines, particularly within the German wine law system that helps identify the origin of the grapes used in wine production. This term highlights the importance of collective vineyard areas in terms of regionality and characteristic wine styles, contributing to understanding how terroir influences the final product.

Regarding the other choices, while a single vineyard would be referred to as an "Einzellage," and a wine classification system would involve designations like Prädikatswein, these do not accurately define what a Grosslage represents. Similarly, a region-specific wine style would be more about the stylistic attributes of wines from a particular area rather than the structural designation of vineyards.