The Rhine and some of its tributaries, such as the Main, Nahe and Neckar, are of eminent importance, especially in Germany, in terms of viticulture. For on the partly steep slopes of these rivers, a large part of the German vineyards are located in 10 (of 13) directly adjacent or nearby German wine-growing regions. The importance of the river is also underlined by the fact that the most important German grape variety Riesling is often called Rheinriesling. The Rhine, like all waters, has a positive effect on viticulture or creates the conditions for it by forming valley slopes.
The river, which is 1,233 km long in total, 857 km of which in Germany, is formed by two headwaters in the canton of Graubünden in the Swiss Alps. After the confluence of the Vorderrhein (77 km) and Hinterrhein (72 km) at the community of Tamins-Reichenau it is called Alpenrhein and flows into Lake Constance at the community of Hard. After flowing through the Obersee it is called Seerhein in the four km long section, flows through the Untersee and is now called Hochrhein after the outlet at Stein am Rhein. Up to Basel, this forms the border between Switzerland in the south and Germany in the north.