Located in the south hemi-delta, it is the largest lagoon of the Ebro Delta. It is divided into two parts: the large pond and the small pond (better known as “el hoyo”). In the northern area of the large pond are a reed bed are and some wetlands, where bulls graze. Its wattle areas house the largest breeding colonies of herons of the Delta, and we may point out the little egret, the cattle egret, the black-crowned night heron, the little bittern, the squacco heron and the purple heron .