Name for the three water bodies Obersee, Untersee and Seerhein lying in the northern Alpine foothills. These are two different, but spatially close lakes, through the designated as Seerhein section of the Rhine are connected. The shore length of both lakes is 273 km, of which 173 in Germany, 28 in Austria and 72 in the Switzerland lie. Together they cover 536 km², which extend between Bregenz (Vorarlberg, Austria) and Stein am Rhein (Schaffhausen, Switzerland). Both lakes are crossed by the Rhine; The main tributary of the Obersees is the Alpine Rhine, the outflow of the Obersees is the Seerhein - which in turn is the main tributary of the Untersees - and outflow of the Untersees is the Upper Rhine.
The climate is characterized by mild temperatures with temperate gradients due to the balancing effect of the large water body characterized. Viticulture is operated around the lake. The most common grape varieties are Pinot Noir, Müller-Thurgau and Pinot Blanc. The vineyards belong to different growing areas; however, the similarities within the region are greater than those with the partly distant base areas. In Germany these are the area Bodensee in the cultivation area to bathe, as well as the areas Württembergischer Bodensee and Bayerischer Bodensee in the growing area Wuerttemberg, These are the highest vineyards Germany between 400 and 560 meters above sea level. In Switzerland, these are Rhine Valley in the canton St. Gallen and Untersee in the canton Thurgau, In Austria these are some businesses in Vorarlberg (Bergland Austria).