Ajoie

250px|thumb|right|Map of the Ajoie The Ajoie (; , Frainc-Comtou: Aidjoue) is an historic region roughly coinciding with Porrentruy District in the canton of Jura in northwestern Switzerland.

It is a part of the Jura plain, composed of six geographic areas: the Vendline (river) valley (northeast), with the communities Vendlincourt, Bonfol and Beurnevésin; La Baroche (east): Miécourt, Charmoille, Fregiécourt, Pleujouse and Asuel; the flanc du Mont Terri (south): Cornol, Courgenay, Fontenais and Bressaucourt; the Haute-Ajoie (west): Courtedoux, Chevenez, Rocourt, Roche-d'Or, Réclère, Damvant, Grandfontaine, Fahy and Bure; Allaine (river) valley (centre and north): Alle, Porrentruy, Courchavon, Courtemaîche, Montignez, Buix and Boncourt; the Coeuvatte valley (north): Coeuve, Damphreux and Lugnez.