بحيرة قارون
to the west of the Nile Valley. The Bahr Yussef veers west through a narrow neck of land north of Ihnasya, between the archaeological sites of El Lahun and Gurob near Hawara; it then branches out, providing rich agricultural land in the Faiyum basin, draining into the large saltwater Lake Moeris (Birket Qarun). The lake was freshwater in prehistory but is today a saltwater lake. It is a source for tilapia and other fish for the local area.