Museu de l'Arión: an open-air museum
Ulldecona lies in the very south of Catalonia, in the region of the Montsià and close to the river Sénia. In its extensive territory (126,8km ²) there are 1,379 Millenary Olive Trees which makes it the municipality with the largest number of millenary olive trees in the world. Although some specimens are also in lower areas, the vast majority are located in the slopes of the Montsià and Godall mountains.