网页The Luy is the union of two neighboring rivers, the Luy de Béarn, which is 77 kilometres (48 mi) 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.