Oil from millennial olive trees of the Territori Sénia Food and drink · la Sénia, Montsià, Tarragona Image of la Sénia, not of the place itself. The districts around the river Sénia concentrate one of the largest groupings of thousand-year-old olive trees in the world, coordinated by the association of the Taula del Sénia. From these trees, of the farga variety, come oils of mild bitterness and herbaceous aroma. Photo: DagafeSQV (CC BY-SA 3.0) What to see and do in la Sénia