The old lagoon of Ullastret, which dried up at the end of the 19C, is now a pleasant fertile plain dotted with olive and cypress groves. It is also the site of the remains of an Iberian oppidum, dating from the 7C BC. The ruins of this former stronghold are a valuable archaeological resource, as they provide an insight into the life of its inhabitants in the 4C and 3C BC. On the site, the former chapel of Sant Andreu houses the Museu Arqueològic d'Ullastret.