A mountain pass near the Waste Forest, in the land owned by Perceval’s mother.
R.S. Loomis read it as Snowdon, but other scholars have disagreed.
Sources
Perceval, or Le Conte del Graal | Chrétien de Troyes, late 12th century
Fourth Continuation of Chrétien’s Perceval | Gerbert de Montreuil, c. 1230