The 527 km long river (also known as Maa, Mää and Mee) arises from a confluence of the two source rivers Weißer Main (Fichtelgebirge) and Roter Main (Frankische Alb) in Bavaria- Germany, The longest right tributary of the Rhine flows through the wine-growing region in a large W-shape between Aschaffenburg and Schweinfurt Franconia, All vineyards are on south-facing valley slopes on the banks of the Main or in side valleys of its tributaries (Franconian Saale, Kinzig, Nidda, Regnitz, Tauber ) created. After the flow of the urban spaces Würzburg and Frankfurt am Main it flows opposite the old town of Mainz between Ginsheim-Gustavsburg and the Wiesbaden district of Mainz-Kostheim in the Rhine.
The course of the Main in Lower Franconia forms two striking, so to speak geometric forms of landscape, namely that Maindreieck and the Mainviereck, which also gave their name to two Franconian wine-growing areas. A large part of the Franconian vineyards with around 4,200 hectares of vineyards is located directly on or around the main triangle. A special feature is the wine island in the district of Kitzingen between an original arm of the Main (Altmain) and the Main Canal between Volkach and Gerlachshausen. Viticulture is practiced on this island created by human influence. The Mainviereck covers only 330 hectares of vineyards. Like everyone in principle waters The Main exerts a climate-regulating, positive influence on viticulture.