Kessingland Beach reclaimed from the sea with much planting of Marram Grass mainly thought up by Rider Haggard when he stayed at his holiday home at Kessingland, this view is looking towards the distant Lowestoft
The Marram Grass taking a foothold creating a natural barrier from the fragile coastline at Kessingland, without it the sea would [at high tide] be lapping up against the seawall
The Sluice at Benacre lifting the river water from The Hundred River over 20' in height to discharge into the North Sea, without the pumping station here and the nearby cliffs/bunds the Hundred River 'valley' would be wide and long at various stages of the tide [eg Blythburgh comes to mind]