The Estany de Sils is an area of remarkable scenic interest and extremely unique within a predominantly Mediterranean environment.
In the current vegetal landscape dominates the mixed riparian wooded areas with some clearings of alders, as well as notable fragments of waterlogged vegetation that occupy the floodplains, such as watercress, reedbeds, bulrushes, communities of duckweeds and grasslands of Cyperaceae and Juncaceae.
The set of aquatic or hygrophilous plant communities constitute an important vestige of the primitive vegetation that occupied these lagoon lands. It is remarkable the presence of the martagon lily, the snowdrop and the wood anemone.
In some cases these communities are quite unique and are not represented in other wetlands in Catalonia. It is necessary to mention, however, the special fragility of these natural systems, vulnerable to any disturbing action of the environment.