This area, owned by Fundació Catalunya-La Pedrera, is one of the most important bird nesting spots. Together with Tancada, it is included in the environmental recovery project LIFE Delta Lagoon.
Alfacada is a lagoon that was formed by the contribution of sediments from the arm of the Migjorn and the enlargement of the beach front which closed off the coastal water mass.
It represents an important ecological area of the Delta, as it has great biodiversity in a small area. It is one of the places with the greatest presence of nesting birds due to the quality of the habitat, which is particularly favourable for migratory birds.