low scarps with the dip slopes towards the centre. The varying nature of the clays, limestones and chalk gives rise to the characteristics of the regions such as Champagne Humide (Damp Champagne), Champagne Pouilleuse (poor Champagne), the Pays de Caux and the Pays de Bray.

Due to the millions of years of later deposition, erosion and other changes since, five drainage basins today drain almost all of the Basin.

These are two flowing north, the basins/specified

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