Arhansus is located in the former basque province of Lower Navarre some 10 km south of Saint-Palais and 8 km north-east of Larceveau-Arros-Cibits. Access to the commune is solely by country roads with at least two country roads connecting the village to the D933 road from Larceveau-Arros-Cibrits to Uhart-Mixe which passes outside and parallel to the western border of the commune. The commune consists almost entirely of farmland with a few small patches of forest.^[6]

The Bidouze river forms the western border of the commune flowing north with two small streams rising in the commune and joining it. One stream is the northern border of the commune.^[6]

^[10]

The commune's name in basque is Arhantsusi^[3][5] (or Arhantsuse^[11]). The name is based on the basque radical Arhan-, Arran- from where Arhantz is derived^[12] but the etymology "where blackthorn abounds"^[13] is uncertain.^[12]

The following table details the origins of the commune name and other names in the commune.

Sources:

• Orpustan: Jean-Baptiste Orpustan, New Basque Toponymy^[12]
• Raymond: Topographic Dictionary of the Department of Basses-Pyrenees, 1863, on the page numbers indicated in the table. (in French)^[8]
• Cassini: Cassini Map from 1750^[14]

Origins:

• Pamplona: Titles of Pamplona^[15]

This list is incomplete; you can help by adding missing items. (April 2021)

List of Successive Mayors^[16]

Arhansus is part of seven inter-communal structures:

• the Communauté d'agglomération du Pays Basque;
• the AEP association of Ostabaret;
• the Energy association of Pyrénées-Atlantiques;
• the inter-communal association for the single purpose of Oztibarre Garbi;
• the inter-communal association for the development and management of the slaughterhouse at Saint-Jean-Pied-de-Port;
• the association for the operation of schools in Ostibarret;
• the association to support Basque culture.

In 2017 the commune had 74 inhabitants.

Economic activity is mainly agricultural. the commune is part of the Appellation d'origine contrôlée (AOC) zone of Ossau-iraty.

Several sites in Arhansus are registered as historical monuments:

• The Protohistoric Camp at Castellu Cahara^[7] at an altitude of 361m
• A second Protohistoric Camp at Portasanse.^[9]
• Houses and Farms (18th-19th century)^[19]

The Parish Church of Saint-Étienne (15th century) is registered as an historical monument.^[20]

The Church

• 
  Stained Glass
• 
  Relief

• Communes of the Pyrénées-Atlantiques department