South West France is a wine region covering several wine-producing areas situated inland from the south of Bordeaux to the Atlantic coast.
Thus, the region covers both the upstream areas around the rivers Dordogne and Garonne and their tributaries, as well as the wine-producing areas of Gascony including Béarn, and the Northern Basque Country. However, only areas closer to the Atlantic than to the Mediterranean are included in the region with the city of Toulouse bordering almost onto the Languedoc-Roussillon region.
The brandy-producing region Armagnac is situated within Gascony and the wine region of South West France, and some of its grapes are used to make Vin de Pays under the designation Vin de Pays de Côtes de Gascogne or mixed with Armagnac to produce the mistelle Floc de Gascogne.
South West France is a rather heterogeneous region in terms of its wines and of how they are marketed. The smaller areas and individual appellations market their wines under their own (smaller) umbrella, in contrast with common practice in e.g. the Bordeaux region. The areas closest to Bordeaux produce wines in a style similar to those of Bordeaux, and largely from the same grape varieties. Further south, wines are still similar to those of Bordeaux but several other grape varieties are more common, such as Tannat and the areas closest to the Pyrenees, you will find more local grape varieties such as Gros Manseng and Petit Manseng.