Luy
The Luy is a left tributary of the Adour, in the Landes, in the Southwest of France. It is  long, including its right source river Luy de France. Geography 
The Luy is the union of two neighboring rivers, the Luy de Béarn, which is  long, in the south, and the Luy de France, the main course. Both rise in Béarn, at the base of the plateau of Ger, east of Pau. They flow north-west through the Chalosse region and join below the castle of Gaujacq. The Luy flows into the Adour downstream from Tercis-les-Bains (south of Dax). Départements and towns 

 Luy de France:
 Pyrénées-Atlantiques: Morlaàs, Thèze, Casteide-Candau. Luy:
 Landes: Castelnau-Chalosse, Pomarez. Main tributaries 
 Luy de France:
 (R) Souye, from Espoey. (L) Riu Mayou, 
 (L) Arance, 
 Luy :
 (L) Grand Arrigau. (R) Arrigau du Gert. References

Rivers of France
Rivers of Landes (department)
Rivers of Pyrénées-Atlantiques
Rivers of Nouvelle-Aquitaine