Alpgau (also ''Albgau'') was a territory of Alemannia and the

Duchy of Swabia The Duchy of Swabia ( German: ''Herzogtum Schwaben'') was one of the five stem duchies of the medieval German Kingdom. It arose in the 10th century in the southwestern area that had been settled by Alemanni tribes in Late Antiquity. While th ...

during the 8th to 12th centuries.
It comprised Sankt Blasien Abbey in the Black Forest, St. Blaise in what is now the Waldshut district of

Baden-Württemberg Baden-Württemberg (; ), commonly shortened to BW or BaWü, is a German state () in Southwest Germany, east of the Rhine, which forms the southern part of Germany's western border with France. With more than 11.07 million inhabitants across a ...

. It is not to be confused with ''Alpengau'', now known as

Allgäu The Allgäu (Standard German: , also Allgovia) is a region in Swabia in southern Germany. It covers the south of Bavarian Swabia, southeastern Baden-Württemberg, and parts of Austria. The region stretches from the pre-alpine lands up to the A ...

References

Geography of Baden-Württemberg {{Germany-geo-stub