Dordogne River, Beynac, France:

The Dordogne (Occitan: Dordonha) is a river in south-central and southwest France.Contrary to appearances, the name of the Dordogne is not a recent word resulting from the names of the Dore and the Dogne. It comes from an ancient Durānius, dérived from a Pre-Celtic root dur-, dor- (as the Durance). The medieval forms adopted a redoubled suffix -ononia: Dorononia fluvius (sixth century), Dornonia (eighth century) that evolves in Dordonia (ninth century) by a phenomenon of dissimilation, giving the impression of an etymology *Dore-Dogne.
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