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It is formed from a meander of the Sor river.
The island had a Celtic settlement (Castro) on the hill in the middle of the island. This settlement is called "Cova dos Mouros" by the local people.
During the Middle Ages there was a Benedictine convent that lasted until the 15th century, Maria Vizoso being its last prioress.
It was a fertile, well-cultivated soil. Nowadays it is the island with the most forest mass (eucalyptus) in all of Europe.
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