Adour

The Adour (, ) is a river in southwestern France. It flows through the Occitanie and Nouvelle-Aquitaine regions.
It starts in the Pyrenees, at the Arbizon mountain. It flows into the Atlantic Ocean (Bay of Biscay) near Bayonne.
Geography.
The Adour river has a length of . Its drainage basin has an area of approximately .
Course.
The Adour river starts, as Adour de Payolle, at the north side of the Arbizon mountain. This river combines with the Adour de Gripp and the Adour de Lesponne to form the Adour river at Campan.
The Adour flows north for almost through the Hautes-Pyrénées to Gers. There, it turns to the west and gets into the Landes department. In Port-de-Lanne, the Adour is joined by the Gaves réunis river. Finally, it flows into the Bay of Biscay, in the Atlantic Ocean, between Anglet (Pyrénées-Atlantiques) and Tarnos (Landes).
Boats can travel on the river beginning about from its mouth.
Tributaries of the Adour.
Some of the important tributaries (longer than ) of the Adour are:
Towns along the river.
"Départements" and towns found along the Adour river are:
Hydrology.
The average yearly discharge for the Adour river is at Saint-Vincent-de-Paul in the Landes department.
The Adour shows typical seasonal changes. The highest levels of the river are in winter and spring, from December to May inclusive, with the highest level in February. They are followed by a rapid fall in the flow during the low water period that goes from July to October.