Saint-Paul-Trois-Châteaux, sometimes known as St-Paul-en-Tricastin, is a commune, an administrative region, in the Drôme department in southeastern France. The settlement is attested as Augusta Tricastinorum, Trikastinoi ōn polis Noiomagos, Sancti Pauli vel Sancti Restituti Trigastinensi, in Tricastrinensi, civitate Tricastrina, San Paul, Sanctum Paulum Tricastinensem, and Sainct Pol Trois Chasteaux.
Country: France
Region: Auvergne-Rhône-Alpes
Area: 22.04 km² (8.51 sq mi)
Elevation: 49–290 m (161–951 ft) · (avg. 111 m or 364 ft)