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Sedgemoor, district, administrative and historic county of Somerset, southwestern England, in the north-central part of the county. Bridgwater, on the River Parrett in the southwest, is the administrative centre. Sedgemoor district is generally a low-lying basin with rich alluvial soils. It is bordered by the Quantock Hills to the southwest, the Bristol Channel to the northwest, the Mendip Hills to the northeast, and the more elevated extensions of the Sedgemoor Basin to the south and...