The commune can be accessed by the D401 road fromSaint-Jean-Pied-de-Port in the northwest to the village. From the village the D118 road goes north to join the D18 highway.[5]
Located in thedrainage basin of the Adour, the northeastern border of the commune is marked by the Laurhibar river, which flows north to join theNive north ofSaint-Jean-Pied-de-Port. A stream rises near the village and flows to the Laurhibar in the north-east. The Urtchipea rises in the south of the commune and flows northwest gathering many tributaries and joins theNive de Beherobie atSaint-Michel. The Sassitako erreka rises southwest of the village and flows northwest joining the Laurhibar east ofSaint-Jean-Pied-de-Port.
The commune name inbasque isAintzila meaning "hill of mud",[6]Aintzila[7] orAintzil-Harrieta.[8]
Jean-Baptiste Orpustan wrote the name of the commune in the formAïncille. He also indicated that in Basque the inhabitants are referred to asAintzildar.[7]
The following table details the origins of the commune name.
Quarterly, first Azure a bridge of Or masoned in sable debruised over a wave of argent in base, in chief 3 stars the same arranged in fesse; second of Or with an eagle displayed in sable; three vert a cow of Or collared and belled in azure posed in base surmounted by a sheep of argent horned in Or; fourth azure with a church in Or in profile roofed the same extended at dexter with a porch abased and surmounted at dexter by a belltower and steeple the same supporting a cross in sable, windows and doors the same..
Aincille had long receivedsaline (saline of Ugarré) since the 17th century and had the distinction of being a corporation with ownership of twenty-nine old houses of the town[15] and was reunited with the royal domain in 1683.
According to theMap of the Seven Basque Provinces published in 1863 by PrinceLouis-Lucien Bonaparte, the dialect of Basque spoken in Aincille is EasternLow Navarrese.
TheParish Church of the Assumption of the Blessed Virgin Mary and Saint John the Baptist (Middle Ages)[21] The church contains two items that are registered as historical objects: