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The Southern Rhône region is predominantly characterized by flat valley floors, which are formed by the Rhône River and its tributaries. This geographical feature plays a crucial role in viticulture in the area, as the flat terrain facilitates easier cultivation of grapevines. The valley floors also benefit from a Mediterranean climate, with warm summers and mild winters, making them ideal for grape growing.

The flat landscape allows for better air circulation and drainage, which are important factors in reducing humidity, thus minimizing the risk of rot. Additionally, the soils found on these valley floors are often rich in nutrients and well-drained, contributing positively to the health and vitality of the vines. This combination of temperature regulation, air movement, and soil composition significantly impacts the quality of the grapes produced in the Southern Rhône, leading to the development of its well-known wines.

While other options do exist within the broader context of the region, such as mountain slopes and rocky outcrops, it is the flat valley floors that play the most essential role in the agricultural practices of the Southern Rhône's vineyards.