|Main source||Plateau of Ger|
|Progression||Adour→ Atlantic Ocean|
|Length||117 km (73 mi)|
The name Gabas is derived from the French 'gave' (Gascon: 'gabe'), which in the Pyrenees generically describes a small or large watercourse. The river was known as the fluvius gavasensis in 982.
A dam of 20 million cubic metres (16,000 acre·ft) was built in its upper course to regulate the lowest water level.
- (R) the Bayle from Lourenties
- (R) the Bas, from Geaune
- (L) the Laudon, from Hagetmau
- cartulary of Saint-Sever.
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