Name [1] Location Area (km2 ) Designated Description Image Abberton Reservoir Essex 51°49′N 0°52′E / 51.817°N 0.867°E / 51.817; 0.867 (Abberton Reservoir ) 7.26 24 July 1981 An artificial body of water with populations of golden plover , gadwall , shoveller , teal and cormorants . Alde – Ore Estuary Suffolk 52°5′N 1°33′E / 52.083°N 1.550°E / 52.083; 1.550 (Alde-Ore Estuary ) 25.47 4 October 1996 Arun Valley West Sussex 52.9 16 December 1999 Avon Valley Hampshire 13.85 2 February 1998 Benfleet and Southend Marshes Essex 22.51 14 February 1994 Blackwater Estuary Essex 43.95 11 March 1992 Breydon Water Norfolk 12.03 29 March 1996 Broadland Norfolk 46.23 6 January 1976 Chesil Beach and The Fleet Dorset 7.48 17 July 1985 Chichester and Langstone Harbours Hampshire 58.1 28 October 1987 Chippenham Fen Cambridgeshire 1.12 11 March 1992 Colne Estuary 2) Essex Coast 27.01 28 July 1994 Crouch and Roach Estuaries 3) Essex Coast 17.36 24 March 1995 Deben Estuary SSSI Suffolk 9.79 11 March 1996 The Dee Estuary Cheshire , Flintshire 131.31 17 July 1985 Dengie 1) Essex Coast 31.27 24 March 1994 Dersingham Bog Norfolk 1.58 12 September 1995 Dorset Heathlands Dorset 67.3 1 October 1998 Duddon Estuary Cumbria 68.06 16 March 1998 Esthwaite Water Cumbria 1.37 7 November 1991 Exe Estuary Devon 23.46 11 March 1992 Foulness 5) Essex Coast 109.33 4 October 1996 Gibraltar Point Lincolnshire 4.14 5 March 1993 Hamford Water Essex 21.87 8 June 1993 Holburn Lake and Moss Northumberland 0.28 17 July 1985 Humber Estuary Lincolnshire , Yorkshire 379.88 28 July 1994 Irthinghead Mires Cumbria , Northumberland 7.92 17 July 1985 Isles of Scilly 40.2 13 August 2001 Lea Valley Greater London , Hertfordshire 44.8 9 October 2000 Leighton Moss Lancashire 1.29 28 November 1985 Lindisfarne Northumberland 36.79 5 January 1976 Lower Derwent Valley Yorkshire 9.15 17 July 1985 Malham Tarn North Yorkshire 2.86 28 October 1993 Martin Mere Lancashire 1.2 28 November 1985 Medway Estuary and Marshes Kent 46.97 15 December 1993 Mersey Estuary Cheshire , Merseyside , Lancashire 50.33 20 December 1995 Midland Meres and Mosses (Phase 1) 5.11 9 May 1994 Midland Meres and Mosses (Phase 2) 15.88 2 February 1997 Minsmere-Walberswick Suffolk 20.19 5 January 1976 Morecambe Bay Cumbria , Lancashire 374.05 4 October 1996 Nene Washes Cambridgeshire 15.17 5 March 1993 The New Forest Hampshire 16.12 22 September 1993 North Norfolk Coast Norfolk 78.87 5 January 1976 Northumbria Coast Northumberland 11.08 2 February 2000 Ouse Washes Cambridgeshire , Norfolk 24.69 5 January 1976 Pagham Harbour Hampshire 6.37 30 March 1988 Pevensey Levels East Sussex 35.78 2 February 1999 Poole Harbour Dorset 24.39 22 July 1999 Portsmouth Harbour Hampshire 12.49 28 February 1995 Redgrave and South Lopham Fens Norfolk , Suffolk 1.27 15 February 1991 Ribble and Alt Estuaries Lancashire 134.64 28 November 1985 Rostherne Mere Cheshire 0.8 24 July 1981 Roydon Common Norfolk 1.94 5 March 1993 Rutland Water Rutland 13.6 4 October 1991 Severn Estuary Gloucestershire , Monmouthshire , Somerset 247.01 5 January 1976 Solent and Southampton Water Hampshire 54.15 1 October 1998 Somerset Levels and Moors Somerset 63.88 26 June 1997 South West London Waterbodies 82.8 9 October 2000 Stodmarsh Kent 4.81 16 December 1993 Stour and Orwell Estuaries Suffolk 33.24 13 July 1994 The Swale Kent 65.15 17 July 1985 Teesmouth and Cleveland Coast Cleveland 12.47 15 August 1995 Thames Estuary and Marshes Essex , Kent 55.89 5 May 2000 Thanet Coast and Sandwich Bay Kent 21.69 28 July 1994 Thursley and Ockley Bog Surrey 2.65 14 February 1994 Upper Nene Valley Gravel Pits Northamptonshire 2.65 7 April 2011 Upper Solway Flats and Marshes Surrey 2.65 1 October 1986 Walmore Common Gloucestershire 0.53 5 December 1991 The Wash Norfolk , Lincolnshire 622.12 30 March 1988 Wicken Fen Cambridgeshire 2.54 12 September 1995 Woodwalton Fen Cambridgeshire 2.08 12 September 1995 
