Arrast-Larrebieu is located in the former province of Soule some 12 km east by south-east of Saint-Palais and 10 km north by north-east of Mauléon-Licharre. Access to the commune is by the D243 road which branches off the D11 west of the commune and north of Espès-Undurein and passes through the village before continuing north-east to join the D115. The D135 from the D11 in the west to Moncayolle-Larrory-Mendibieu in the south-east passes through the south of the commune and the hamlet of Larrebieu. The commune is mainly farmland with many forests scattered throughout the commune.[4]
The Laxubie rises in the south of the commune and flows north past the village gathering many tributaries and joins the Apaure north of the commune. Several small streams rise in the west of the commune and flow west to join the Saison.[4]
The commune name in basque today is Ürrüstoi-Larrabile[6] or Ürrustoi-Larrebille.[3]
Jean-Baptiste Orpustan indicated that the spelling in BasqueArrast is sometimes given with the determinant Ürrüxtoia meaning "hazel tree grove". He also stated that larrabil means a "rounded moor, squat".[7]
The following table details the origins of the commune name and other names in the commune.
the inter-communal association for the construction and operation of the CES at Mauleon;
the association to support Basque culture.
Demography
The inhabitants of the commune are known as Urrustoitars.[12] The population data given in the table and graph below for 1836 and earlier refer to the former commune of Arrast.
An enclosure with an earthen parapet (a protohistoric fort or Gaztelu zahar) at an altitude of 282 metres at a place called Gazteluxaga reflects the ancient past of the commune.
Religious heritage
The Parish Church of Sainte-Lucie (19th century) is registered as an historical monument.[15] It has a bell tower called Trinity or Souletin meaning the "top of the wall", pierced by bays for the bells with three roof peaks of approximately equal height, hence the name Trinity.[16] The church contains a Processional Cross (17th century) which is registered as an historical object.[17]