The park includes a coastal portion, the Khenfiss lagoon, the biggest lagoon at the Moroccan coast, and the inland portion, located on desert plateaus. The lagoon is also an important bird nesting ground. Ruddy shelduck, marbled duck, and Audouin's gull inhabit the lagoon permanently, and a big number of species migrate here in winter. Every year, about 20,000 birds stay in the lagoon area in the winter season.