Bin el Ouidane (also written Bine el Ouidane) is the reservoir behind the Bin el Ouidane Dam on the El Abid River, in the Atlas foothills of Azilal province in the Beni Mellal-Khenifra region. The arch dam opened in 1953; at 133 metres it was the highest arch dam in Africa when it was built.
When full, the lake covers about 3,750 hectares, with a long shoreline of inlets and coves between olive- and almond-covered hills. In recent drought years the water has dropped far below capacity, leaving wide red-earth banks.
Moroccan visitors, many from Beni Mellal and Casablanca, come for weekend fishing and picnics. A few small guesthouses along the shore arrange boats and kayaks.