Upper course of the Sénia River in the Ports de Beseit
|Origin||Barranc del Salt, Ports de Beseit|
|Mouth||Sòl de Riu, Mediterranean Sea|
|Source elevation||1,200 m|
|Mouth elevation||0 m|
|Basin area||197.7 km²|
The Sénia River (Catalan: Riu de la Sénia, Spanish: Río Cenia) is a river in the provinces of Castellón and Tarragona, Spain. It begins its course at 1,200 m in the Barranc del Salt, Ports de Beseit. limestone massif near La Pobla de Benifassà.
The Sénia flows from west to east marking the historical limits between Catalonia (Montsià) and the Valencian Community (Baix Maestrat). It ends its course in the Mediterranean Sea at Sòl de Riu., between Vinaròs and Alcanar municipalities. Its flow is highly irregular. Some years its riverbed remains dry during the whole stretch of its lower course.
The Ulldecona Reservoir is a dam built across three tributaries of the Sénia river in the Tinença de Benifassà area. With a surface of 116 hectares and a capacity of 11 hm³, this reservoir is very important for the irrigation of the fields of the region.
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