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

Duchy of Swabia The Duchy of Swabia (; ) was one of the five stem duchy, stem duchies of the medieval Kingdom of Germany, 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 states of Germany, 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 i ...

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

References

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