The Somerset Levels consist of marine clay "levels" along the coast, and the inland (often peat based) "moors". The area borders the Severn Estuary with its very high tidal range which used to cause marine flooding, but this is now largely controlled by various sea defences. The Levels are divided into two by the Polden Hills, with the catchment areas of the River Parrett to the south, and the rivers Axe and Brue to the north. This area is separate from the North Somerset Levels, which is located inland from Weston-super-Mare.
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