Amposta Winter Main Festival Activity · Amposta, Montsià, Tarragona Image of Amposta, not of the place itself. Amposta's Festa Major d'Hivern is held in the capital of the Montsià, whose Torre de la Carrova, built around 1280 on a rocky outcrop, controlled, together with that of Campredó, the mouth of the Ebro. Photo: B. Barberà (Public domain) What to see and do in Amposta