Farga olive tree of l'Arion Food and drink · Ulldecona, Montsià, Tarragona Image of Ulldecona, not of the place itself. Olive tree of the farga variety with a trunk of exceptional girth to which an age of more than a thousand years is attributed, on the estate of l'Arion. It is the best-known specimen of the group of monumental olive trees from which the thousand-year-old-tree oil is extracted. Photo: Juan Emilio Prades Bel (CC BY 4.0) What to see and do in Ulldecona