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See also:ADOUR (anc. Aturrus or Adurus, from See also:Celtic dour, See also:water)
, a See also:river of See also:south-See also:west See also:France, rising in the See also:department of Hautes See also:Pyrenees, and flowing in a wide See also:curve to the See also:Bay of See also:Biscay
.
It is formed of several streams having their origin in the massifs of the Pic d'Arbizon and the Pic du Midi de Bigorre, but during the first See also:half of its course remains an inconsiderable river
.
In traversing the beautiful valley of See also:Campan it is artificially augmented in summer by the See also:waters of the See also:Lac Bleu, which are See also:drawn off by means of a See also:siphon, and flow down the valley of Lesponne
.
After passing Bagneres de Bigorre the See also:Adour enters the See also:plain of See also:Tarbes, and for the See also:remainder of its course in the department of Hautes Pyrenees is of much less importance as a waterway than as a means of feeding the numerous See also:irrigation canals which See also:cover the plains on each See also:side
.
Of these the See also:oldest and most important is the See also:Canal d'See also:Alaric, which follows the right See also:bank for 36 m
.
Entering the department of See also:Gers, the Adour receives the Arros on the right bank and begins to de, See also:scribe ,the large westward curve which takes it through the department of See also:Landes to the See also:sea
.
In the last-named department it soon becomes navigable, namely, at St Sever, after passing which it is joined on the See also:left by the Larcis, Gabas, Louts and Luy, and on the right by the Midouze, which is formed by the See also:union of the Douze and the Midour, and is navigable for 27 m.; now taking a south-See also:westerly course it receives on the left the Gave de See also:Pau, which is a more voluminous river than the Adour itself, and flowing past See also:Bayonne enters the sea through a dangerous See also:estuary, in which sandbars are formed, after a See also:total course of 208 m., of which 82 are navigable
.
The mouth of the Adour has repeatedly shifted, its old See also:bed being represented by the See also:series of etangs and lagoons extending northward as far' as the See also:village of Vieux Boucau, 222 M. See also:north of Bayonne, where it found a new entrance into the sea at the end of the 14th See also:century
.
Its previous mouth had been 10 m. south of Vieux Boucau
.
The See also:present channel was constructed by the engineer See also:
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