| Gabas | |
| Pushpin Map: | France#France Nouvelle-Aquitaine |
| Mouth Coordinates: | 43.7614°N -0.7025°W |
| Subdivision Type1: | Country |
| Length: | 117km (73miles) |
The Gabas (in French pronounced as /ɡabas/; Occitan (post 1500);: Gabàs) is a left tributary of the Adour, in the Landes, in the Southwest of France. It is 116.7km (72.5miles) long.
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.[1]
A tributary of the Léez is named the Gabassot, a hypocoristic of Gabas.
The Gabas rises in the plateau of Ger in the north of Lourdes, as the union of the Gabastou and the Honrède. It flows north-west like the neighboring rivers: the Luy, the Uzan and the Ousse.
The Gabas crosses the Tursan, in the Landes. It flows into the Adour in Toulouzette, downstream from Saint-Sever.
A dam of 20e6m3 was built in its upper course to regulate the lowest water level.