The valleys of the Aire and other rivers traverse it longitudinally, a fact to which its importance as a bulwark of north-eastern France is largely due.
Between the Aire and the Aisne.
It is picturesquely situated in the hilly district of the upper valley of the river Aire, the course of which is followed by the Leeds and Liverpool canal.
- Aire, Tarbes, Bayonne.
At the instance of Euric's son, Alaric II., an examination was made of the Roman laws in use among Romans in his dominions, and the resulting compilation was approved in 506 at an assembly at Aire, in Gascony, and is known as the Breviary of Alaric, and sometimes as the Liber Aniani, from the fact that the authentic copies bear the signature of the referendarius Anian.