Berrias-et-Casteljau is a commune in the Ardèche department in southern France.

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Berrias-et-Casteljau
Commune
Commandery of Jalès
Coat of arms
Location of Berrias-et-Casteljau
Berrias-et-Casteljau Show map of France Berrias-et-Casteljau Show map of Auvergne-Rhône-Alpes
Coordinates: 44°22′33″N 4°12′04″E
Country	France
Region	Auvergne-Rhône-Alpes
Department	Ardèche
Arrondissement	Largentière
Canton	Les Cévennes ardéchoises
Government
• Mayor (2020–2026)	Robert Balmelle[1]
Area 1	26.42 km2 (10.20 sq mi)
Population  (2021)[2]	765
• Density	29/km2 (75/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	07031 /07460
Elevation	100–262 m (328–860 ft) (avg. 130 m or 430 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

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The Chassezac flows southeast through the northern part of the commune, then forms part of its eastern border.

The Berriasian Age of the Cretaceous Period of geological time is named for the village of Berrias in the commune.

• Communes of the Ardèche department