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The origin of the park. Until the 1970s it had been the largest in the entire delta, but the intense exploitation of the surrounding rice fields and the construction of bypass canals caused the area to lose its extension. Of the three basins that were initially there, only two remain: Estella and Illot. Freshwater enters through three drains, while seawater arrives through two. The lagoon is privately owned, and the Canal Vell Biological Station is located there.