Sundgau is a geographical territory in the southern Alsace region, on the eastern edge of France. The name is derived from Alemannic German Sunt-gowe, denoting an Alemannic county in the Old High German period. The principal city and historical capital is Altkirch.

Alsace is a cultural region and a territorial collectivity in eastern France, on the west bank of the upper Rhine next to Germany and Switzerland. In January 2021, it had a population of 1,919,745. Alsatian culture is characterized by a blend of German and French influences.