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The Beaurepaire Plain, which is located to a large extent in the Drôme department, follows on from the Bièvre and Liers Plains. It differs from these two by a slightly more irregular relief, a more extensive drainage system (valley of the Oron, Deroy and Dolon), and smaller plots of land, which are occupied in part by meadows and occasionally highlighted by a bocage that follows the streams.

As the Beaurepaire Plain touches on the Rhône Valley, right at St-Rambert-d'Albon (in the Drôme), and opens on to the Bièvre Plain, it is now served by numerous roads.

The eastern part of the plain, up to a radius of four kilometres (2.5 miles) around Beaurepaire, resembles the landscapes of the Bièvre Plain , whereas the western part, from Pact and the TGV southeast line up to Chanas, is more varied, in particular because of the increasing presence of the orchards so typical of the Rhône Valley.

Around Beaurepaire, is the kingdom of large or even very large-scale cropland: the size of the plots is even larger than in the Bièvre Plain. However, the delicate, narrow wooded slopes of the glacial terraces extend onwards from the slopes at the foot of which Beaufort, Thodure and Marcilloles are located. They create a more varied landscape that benefits Beaurepaire, which is located at the foot of the hill overlooking Oron.

The plain changes its look between Pact and Agnin. It narrows to a width of no more than 4 kilometres/2.5 miles between the hills of Taravas to the north and the small plateau to the south, where one can see orchards, mainly apple groves. The smaller scale gives rise to more close-up vistas and greater diversity . The features of the relief are more striking, the roadwork more dense, and the vegetation more diversified, in particular in the Dollon Valley, with its poplar groves and its bocage. Arboriculture, with everything this implies for the environment, in particular greenhouses, is a clear signal of the garden ambience of the immense orchards of the Rhône Valley.