Arrien is located some 18 km east by north-east of Pau and 5 km west of Séron. Access to the commune is by road D42 from Sedzère in the north passing through the heart of the commune east of the village and continuing south to Eslourenties-Daban. The D145 also comes from Baleix in the north and joins the D42 in the commune then continues south-west to Lourenties. Access to the village (Town Hall) is by the Chemin de l'Eglise going west from the D42 and by other local roads. Apart from some patches of forest on the western border the commune is entirely farmland.[3]
The Canne stream forms the southern border of the commune joining the Gabas at the south-western corner which in turn forms most of the western border of the commune flowing north-west then north eventually joining the Adour near Toulouzette. The Poundets stream forms the eastern border of the commune and flows north to join the Petit Lees near Lombia.
The commune is part of four inter-communal structures:
the Communauté de communes du Nord-Est Béarn;
the AEP association of Luy and Gabas;
the Energy association of Pyrénées-Atlantiques;
the inter-communal association for the construction of the Soumoulou rescue centre;
Demography
In 2017 the commune had 185 inhabitants.
Historical population
Year
Pop.
±% p.a.
1793
209
—
1800
201
−0.56%
1806
191
−0.85%
1821
231
+1.28%
1831
252
+0.87%
1836
239
−1.05%
1841
265
+2.09%
1846
269
+0.30%
1851
270
+0.07%
1856
272
+0.15%
1861
308
+2.52%
1866
281
−1.82%
1872
250
−1.93%
1876
241
−0.91%
1881
235
−0.50%
1886
208
−2.41%
1891
190
−1.79%
1896
193
+0.31%
Year
Pop.
±% p.a.
1901
189
−0.42%
1906
218
+2.90%
1911
187
−3.02%
1921
161
−1.49%
1926
180
+2.26%
1931
163
−1.96%
1936
154
−1.13%
1946
135
−1.31%
1954
135
+0.00%
1962
132
−0.28%
1968
125
−0.90%
1975
112
−1.56%
1982
120
+0.99%
1990
138
+1.76%
1999
135
−0.24%
2007
121
−1.36%
2012
160
+5.75%
2017
185
+2.95%
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The former Chateau of Arrien (19th century)..[15] The original chateau was sold in 1730 and converted to a presbytery. The building was sold by the commune in 1975. It is shown on the Cassini Map as a "chateau".
Religious Heritage
The Parish Church of Saint John the Baptist (19th century) is registered as an historical monument.[16] The church contains several items that are registered as historical objects: