Lake Moeris

Lake Moeris (Ancient Greek: Μοῖρις, genitive Μοίριδος) was an ancient endorheic freshwater lake located in the Faiyum Oasis, 80 km (50 mi) southwest of Cairo, Egypt, which persists today at a fraction of its former size as the hypersaline Lake Qarun (Arabic: بركة قارون). In prehistory it was fed intermittently by the Nile via the ancient Hawara Channel, fluctuating in level throughout the Paleolithic and Neolithic periods. The prehistoric Lake Moeris spanned much of the area of the modern Faiyum Oasis, with a total area estimated at between 1,270 km (490 sq mi) and 1,700 km (660 sq mi).

During the Middle Kingdom, excavation of the Hawara Channel to create the canal now known as the Bahr Yussef increased the volume of inflow into Lake Moeris, and concurrent drainage and land reclamation projects would see the lake exploited for agricultural purposes. Further drainage and reclamation during the early Ptolemaic Kingdom effectively severed Lake Moeris' direct connection to the Nile and began a gradual trend of recession that continued through the Roman, medieval and early modern periods, resulting in the Lake Qarun of the present day. The modern lake's surface is 43 m (141 ft) below sea-level, and covers about 202 km (78 sq mi).