found: Work cat.: Fénié, J.-J. L'invention de la Côte d'Argent:p. 5. (For about 220 kilometres, between the Pointe de Grave in the north and the Pays Basque, the Gascon coast is the littoral of the Aquitaine region ...) back cover (In March 1905, as tourism and the motor car were becoming popular, the long beaches of the Aquitaine littoral were named "Côte d'Argent" by the Bordeaux journalist Maurice Martin.)
found: Columbia gaz. of the world online(Argent, Côte d' - name given to a coastal strip of SW France along the Bay of Biscay, extending from the Gironde estuary (N) to the Span. border (S))
found: France-for-visitors.com WWW site April 21, 2006:p. 1 (The Côte d'Argent is the long stretch of coast from the mouth of the Gironde estuary to Biarritz, which - at over 200km - is the longest, straightest and sandiest in Europe.)
notfound: Webster's new geog. dict.;Lippincott 1961