distinction between these two portions of the river is considerable. North of Aswan, the river bed is not rocky, but is instead composed of sediment, and far from being a shallow river. It is believed that the bedrock was previously eroded to be several thousand feet deep. This created a vast canyon that is now filled with sediment.

Despite these characteristics, some of the cataracts which are normally impassable by boat because of the shallow water have become navigable during the flood season.

History

The word "cataract"

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