The town is part of the country Basque province of Cize of Lower Navarre. It is located in the Pyrenees mountains some 40 km in a direct line southeast of Bayonne and about 15 km northeast of the Spanish border. The commune is mostly farmland with scattered small forests.
Access to Ainhice-Mongelos is via the Highway D933 (old highway 133) which runs northeast from Saint-Jean-le-Vieux which runs from southwest to northeast along the eastern side of the commune through the village of Mongelos continues northeast, ending near Saint Palais. Just south of the commune at Lacarre, the Highway D422 branches from the D933 to the northwest and passes through the western side of the commune, ending at Lopeenia just to the west of the commune. No other highways enter the commune. The village of Anhice-Mongelos can be reached by a country road from the D933 at Mongelos or by any of the many country roads which cover the commune.
In the Drainage basin of the Adour, the commune is traversed by a tributary of the Nive, the Lakako erreka (which originates in Ainhice-Mongelos) and, a tributary of the Laurhibar, the Arzubiko erreka and by tributaries of the latter, the Bassaguibeléko erreka and the Idiondoa brook. The Artikaitéko erreka which flows into Bidouze also passes through the commune.
The name of the commune in Basque is Ainhize-Monjolose. According to Jean-Baptiste Orpustan the origin of the name Ainhice remains unknown. According to Brigitte Jobbé-Duval Mongelos is a Gascon name meaning Mont Jaloux (Mount Jealous).
The following table details the origins of the commune name and other names in the commune.
|Mongelos en Cize||1477||Raymond||
|Saint-Jean de Mongelos||1703||Raymond||
||A mountain pass between Lantabat and Ainhice-Mongelos|
|Elizaldea||Eliçalde||1412||Mérimée||List of fires in the Kingdom of Navarre|
||Fief, vassal of the Kingdom of Navarre|
||Fief, vassal of the Kingdom of Navarre. Raymond also mentions that there was a Prebendary of the name "founded in the church of Ainhice".|
||Biscay||Fief, vassal of the Kingdom of Navarre|
List of Successive Mayors of Anhice-Mongelos
(Not all data is known)
The commune belongs to seven inter-communal organisations:
In 2010, the commune had 161 inhabitants. The evolution of the number of inhabitants is known through the population censuses conducted in the town since 1793. From the 21st century, a census of municipalities with fewer than 10,000 inhabitants is held every five years, unlike larger towns that have a sample survey every year.[Note 1]
Economic activity is mainly agricultural. The town is part of the zone of appellation of Ossau-iraty.
Euskal Herriko Laborantza Ganbara or the "Chamber of Agriculture for the Basque Country" is an association under the law of 1901 founded on 15 January 2005 and is headquartered in Ainhice-Mongelos.
Several houses and farms are registered as historical monuments. These are:
The town has a kindergarten.
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