Here, a deep dell holds water for much of the summer. It is bordered by warm, south-facing rocks which make an ideal habitat for amphibians and reptiles. The little green Iberian wall lizard may often be seen here.

Sallows and other moisture-loving plants flourish in the damp soil at the bottom of the sanctuary. Sallow flowers produce copious nectar and pollen early in the year when most needed by the newly-arrived migrant songbirds. The excellent cover provided by thick brambles scrambling into the cork oaks encourages these birds to stay and nest.