The Rhône, over 800 kilometres long, is one of the most important wine rivers in the world. Like all bodies of water, it has a positive effect on viticulture or creates the conditions for it by forming valley slopes, some of which are very steep. The river rises at the Furka Pass as a glacial stream in the Swiss Alps of Uri, flows through the canton of Valais and Lake Geneva under the name Rotten, crosses the French border, turns south from Lyon and flows into the Mediterranean south of Arles-sur-Rhône. In the 6th century BC, the Greeks founded the Rhône. The Greeks founded the city of Marseille (Massilia) at the mouth of the Rhône in the 6th century BC and brought the vine to the valley. The Celts (Gauls) were also already cultivating vines in today's Côte Rôtie and Hermitage (Crozes-Hermitage) appellations. Allegedly, they taught the Romans the art of refinement.