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...r year. Agriculture is sparse and limited to river valleys and particular river deltas. * [[River Rapids]]

...Lakelands also occur where geological shield formations block or minimize river drainage. :''River rapids:'' sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity

...its of mud, making it a rich land for agriculture; thus the pattern of the river would dominate every part of Egyptian culture. ...tural communities, strung together like beads along the ribbon of the Nile River north of the First Cataract. By about 5000 BC, Egypt had been unified to so

...Lakelands also occur where geological shield formations block or minimize river drainage. ::''River Rapids:'' sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity