Auch is a commune in southwestern France. Located in the region of Occitanie, it is the capital of the Gers department. The commune of A…Auch is a commune in southwestern France. Located in the region of Occitanie, it is the capital of the Gers department. The commune of Auch is located in the arrondissement of Auch and in the Gers valley, roughly in the centre of the Gers département. Auch is 69 kilometres west of Toulouse, the capital of the Occitanie region, and 74 kilometres from Montauban, 63 kilometres from Agen, 92 kilometres from Mont-de-Marsan, 86 kilometres from Pau and 62 kilometres from Tarbes, the capitals of the neighbouring départements. It is 162 km from Bordeaux, 390 kilometres from Marseille and 409 kilometres from Lyon, the capitals of the neighbouring regions, and 595 kilometres south-west of Paris.