a river of the province of Groningen, in the kingdom of the Netherlands, which runs into the Dollart. It is distinguished by the name of Westerwolder Aa.

Aa, a river in the province of Overyssel, in the Netherlands, that runs into the Zuyder Sea.

Aa, a river of the province of Antwerp, in the Netherlands, which discharges its water into the Neethe.

Aa, a river of France, rising in the Pas de Calais; becomes navigable for barges at St Omer; and, after a course of about forty miles, enters the sea at Gravelines. Two canals are supplied from this river, that of Colne and of Bourbourg. Three small streams in Switzerland bear the same name, one in Saxony, and one in Courland.

Aa, a river in the Russian government of Courland, which rises in the eastern part of that province, and after receiving the waters of the Sussy, the Eckau, the Pluten, the Anz, and the Berse, enters the Dwina.

Aa, a river in the Russian province of Livonia, which runs from east to south-west into the bay of Riga.

AALHUS, a little town of Germany, in the circle of Westphalia and bishopric of Munster. It is the capital of Aahus, a small district; has a good castle; and lies north-east of Coesfeldt. Long. 7. E. Lat. 52. 10. N.