A favourite migratory stopover for many bird species (large waders such as pink flamingoes and herons, teals and ospreys, and one of the last colonies of bald ibis), this nature reserve planted with reeds, and deeper inside with spurges, runs along the Massa River to its mouth, where you can take a long walk on the beautiful beach with a wide swath of dunes; unless you'd rather have a cup of coffee by the seaside, at the Sidi Rbat tourist complex, a lively place during the summer season.