Dried Up Pelusiac & Canopic Distributaries of Nile River in Her Delta Heavily Settled During Days of Old Kingdom Egypt

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When there were seven branches of the Nile rather than two emptying into the Mediterranean, the port city of Menouthis, now submerged, was built near the mouth of the Canopic branch, that distributary now dried up, and along the Pelusiac distributary to the east such as the Israelites built before their Exodus, that distributary now dried up too, so when do they say the Ice Age ended?