The surface is generally flat, and there is much marshland in its southern part, and along its north-eastern shore.
High, and is connected by a narrow strip of marshland with the shore.
Along the west coast extends the "Marshland," a belt of rich alluvial soil formed by the deposits of the North Sea, and varying in breadth from 5 to 15 m.
The work was carried out in the years 174 6 - 1 753, a large tract of marshland being brought under cultivation, a considerable detour cut off, and the main stream successfully confined to the canal, 12 M.
In Kent county there are more than 60,000 acres of tidal marshland, some of which has been reclaimed by means of dykes; Cypress Swamp in the extreme S.