Alès lies 40 kilometres (25 miles) north-northwest of Nîmes, on the left bank of the river Gardon d'Alès, which half surrounds it.

His later successor Sigebert set up the new diocese, comprising fifteen parishes in the area controlled by the Franks, which included a number of towns to the north of the Cevenne: Alès, Le Vigan, Arre, Arrigas, Meyrueis, Saint-Jean-du-Gard, Anduze, and Vissec.

Louis XIII took back the town in 1629, and the Peace of Alès, signed on 29 June of that year, suppressed the political privileges of the Protestants, while continuing to guarantee toleration.

Historically, according to the Encyclopædia Britannica Eleventh Edition (1911): The town has one association football team called Olympique Alès who currently play in the Championnat National.

Historically, according to the Encyclopædia Britannica Eleventh Edition: Louis Pasteur did his research on the silkworm disease (pébrine and flacherie) at Alès, and the town dedicated a bust to his memory.