 and as "Bocontii" on the "Tabula Peutingeriana".The name "Vocontii" probably stems from Gaulish "Uo-conti" ('twenty', perhaps 'twenty-hundred'), after a Gaulish custom of including numbers in tribal names (see "Tri-corii, Petru-corii", the 'three-', 'four-tribes').The territory of the Vocontii was bordered in the north by the Isère river, in the west by the valley of the Rhône river, in the south by the Mont Ventoux and the lower reaches of the Durance river, and in the east by the upper reaches of the Durance.