[2][4] Due to its inland position, the wetland is dependent on the Tagus basin, along with one of its tributaries, the Almonda.

As expected, the nature reserve is dominated by plant species associated with humid environments such as the lakeshore bulrush, the southern cattail or Juncus.

Among the fish, the European eel and two Portuguese endemisms stand out: Achondrostoma oligolepis and the Iberian nase.

[3] The reserve is home to the largest number of white herons in the Iberian peninsula, and they are found there from February/March until the summer.

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