Bahr Yussef
Encyclopedia
The Bahr Yussef, which roughly translates from Arabic
Arabic language
Arabic is a name applied to the descendants of the Classical Arabic language of the 6th century AD, used most prominently in the Quran, the Islamic Holy Book...

 as "the waterway of Joseph
Joseph (Hebrew Bible)
Joseph is an important character in the Hebrew bible, where he connects the story of Abraham, Isaac and Jacob in Canaan to the subsequent story of the liberation of the Israelites from slavery in Egypt....

", is a canal which connects the Nile River with Fayyum in Egypt
Egypt
Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...

. This was originally in prehistoric times a natural offshoot of the Nile which created a lake to the west during high floods. Beginning with the 12th dynasty
Twelfth dynasty of Egypt
The twelfth dynasty of ancient Egypt is often combined with Dynasties XI, XIII and XIV under the group title Middle Kingdom.-Rulers:Known rulers of the twelfth dynasty are as follows :...

, the waterway was enlarged and the Fayyum was developed to enlarge Lake Moeris
Lake Moeris
Lake Moeris is an ancient lake in the northwest of the Faiyum Oasis, southwest of Cairo, Egypt. It persists in modern times as a smaller lake called Birket Qarun. The lake's surface is 140 ft below sea-level, and covers about ....

. The canal was built into the natural incline of the valley, creating a channel 15 km long and 5 m deep that sloped into the Fayyum depression. The canal was controlled by the Ha-Uar Dam, which was actually two dams that regulated the flow into the lake and out of the Nile. As the surrounding area changed at about 230 BC, the Bahr Yussef eventually became neglected, leaving most of Lake Moeris to dry up creating the depression that exists today and the modern province of Al Fayyum.
The Bahr Yussef is believed by one unconventional religious Egyptologist to have been built under the Israelite patriarch Joseph when he was vizier for Amenemhat III.

The Bahr Yussef still exists today, feeding water northwards into the Birket Qarun, parallel with the Nile.
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