The barons of Faucigny dominated the valley of the Arve and its tributary the Giffre and the valley of Doron de Beaufort ( Beaufortain ) .
Its tributary the Giffre is the Arly as far as Flumet .
The barons of Faucigny dominated the valley of the Arve and its tributary the Giffre , the Arly as far as Flumet , and the valley of Doron de Beaufort ( Beaufortain ) .