For thousands of years, annual floods of the Nile deposited valuable soils upon the narrow plain on either side of the river and upon the low-lying delta.
(annual floods of the Nile; deposited; valuable soils; upon the narrow plain; T:on either side of the river and upon the low-lying delta)
annual floods of the Nile
deposited
valuable soils upon the narrow plain T:on either side of the river and upon the low-lying delta