alcombe atlantic ocean avonmouth axbridge bath and north east somerset beachley blackdown hills brendon hills bridgwater bristol channel bruton burnham-on-sea caldicot and wentloog levels cardiff castle cary celtic sea ceremonial counties of england chew valley clevedon congresbury yeo crewkerne culture of somerset denny island dulverton east lyn river economy of somerset england environment agency estuary exmoor flat holm geology of somerset glastonbury gloucester gloucestershire great britain history of somerset hoar oak water ilminster keynsham list of civil parishes in somerset mendip mendip hills midford brook midsomer norton minehead monmouthshire nailsea nash point newport north petherton north somerset penarth polden hills quantock hills radstock river river aller river barle river brue river cary river chew river exe river haddeo river holford river horner river huntspill river isle river parrett river severn river sheppey river somer river tone river washford second severn crossing sedgemoor severn barrage severn beach severn tidal power feasibility study severnside shepton mallet somerset somerset levels somerton south gloucestershire south petherton south somerset steep holm taunton taunton deane tidal range turbidity vale of glamorgan wales watchet wells welsh assembly government welsh language west lyn river west somerset weston-super-mare wincanton wiveliscombe yeovil