delta

The Nile Delta has been one of the world's most productive agricultural regions for thousands of years.几千年来，尼罗河三角洲一直是世界上生产力最高的农业区之一。

Rapid urbanisation in the river delta has increased flood risk by replacing natural floodplains with impermeable surfaces.河流三角洲迅速的城市化进程用不透水表面取代了天然洪泛平原，从而增加了洪水风险。