An Area of Outstanding Natural Beauty (AONB; Welsh: Ardal o Harddwch Naturiol Eithriadol, AHNE) is an area of countryside in England, Wales, and Northern Ireland, that has been designated for conservation due to its significant landscape value. Areas are designated in recognition of their national importance by the relevant public body: Natural England, Natural Resources Wales, and the Northern Ireland Environment Agency respectively. In place of AONB, Scotland uses the similar national scenic area (NSA) designation. Areas of Outstanding Natural Beauty enjoy levels of protection from development similar to those of UK national parks, but unlike national parks the responsible bodies do not have their own planning powers. They also differ from national parks in their more limited opportunities for extensive outdoor recreation.
The idea for what would eventually become the AONB designation was first put forward by John Dower in his 1945 Report to the Government on National Parks in England and Wales. Dower suggested there was need for protection of certain naturally beautiful landscapes that were unsuitable as national parks owing to their small size and lack of wildness. Dower's recommendation for the designation of these "other amenity areas" was eventually embodied in the National Parks and Access to the Countryside Act 1949 as the AONB designation.
The purpose of an AONB designation is to conserve and enhance the natural beauty of the designated landscape.
There are two secondary aims: meeting the need for quiet enjoyment of the countryside and having regard for the interests of those who live and work there. To achieve these aims, AONBs rely on planning controls and practical countryside management. As they have the same landscape quality, AONBs may be compared to the national parks of England and Wales. National parks are well known in the UK; by contrast, there is evidence to indicate many residents in AONBs may be unaware of the status. However, the National Association of AONBs is working to increase awareness of AONBs in local communities, and, in 2014, successfully negotiated to have the boundaries of AONBs in England shown on Google Maps.
There are 46 AONBs in Britain (33 wholly in England, four wholly in Wales, one that straddles the Anglo-Welsh border and eight in Northern Ireland). The first AONB was designated in 1956 in the Gower Peninsula, South Wales. The most recently confirmed is the Tamar Valley AONB in 1995, although the existing Clwydian Range AONB, covering the Clwydian Range only, was extended in 2012 to form the Clwydian Range and Dee Valley AONB, and the Strangford Lough and Lecale Coast AONBs were merged and redesignated as a single AONB in 2010.
AONBs vary greatly in terms of size, type and use of land, and whether they are partly or wholly open to the public. The smallest AONB is the Isles of Scilly, 16 km2 (6.2 sq mi), and the largest is the Cotswolds, 2,038 km2 (787 sq mi). AONB's cover around 15% of England's land area and 4% of Wales'. 
AONBs in England and Wales were originally created under the same legislation as the national parks, the National Parks and Access to the Countryside Act 1949. Unlike AONBs, national parks have special legal powers to prevent unsympathetic development. AONBs in general remain the responsibility of their local authorities by means of special committees that include members appointed by a minister and by parishes, and only very limited statutory duties were imposed on local authorities within an AONB by the original 1949 Act. However, further regulation and protection of AONBs in England and Wales was added by the Countryside and Rights of Way (CRoW) Act 2000, under which new designations are now made, and the government stated in the National Planning Policy Framework (March 2012) that AONBs and national parks have equal status when it comes to planning decisions on landscape issues. Two of the AONBs (the Cotswolds and the Chilterns), which extend into a large number of local authority areas, have their own statutory bodies, known as conservation boards. The Glover Report in 2019 made various recommendations regarding the future of AONB's but as at 1 November 2020 the government has yet to respond to those recommendations. However, the Cotswolds Conservation Board announced in September that they were re-styling the area name and it is now known as the Cotswolds National Landscape.
All English and Welsh AONBs have a dedicated AONB officer and other staff. As required by the CRoW Act, each AONB has a management plan that sets out the characteristics and special qualities of the landscape and how they will be conserved and enhanced. The AONBs are collectively represented by the National Association for Areas of Outstanding Natural Beauty (NAAONB), an independent registered charity acting on behalf of AONBs and their partners, which uses the slogan "Landscapes for Life".
AONBs in Northern Ireland was designated originally under the Amenity Lands (NI) Act 1965; subsequently under the Nature Conservation and Amenity Lands (NI) Order 1985.
There are growing concerns among environmental and countryside groups that AONB status is increasingly under threat from development. The Campaign to Protect Rural England said in July 2006 that many AONBs were under greater threat than ever before. Three particular AONBs were cited: the Dorset AONB threatened by a road plan, the threat of a football stadium in the Sussex Downs AONB, and, larger than any other, a £1 billion plan by Imperial College London to build thousands of houses and offices on hundreds of acres of AONB land on the Kent Downs at Wye. In September 2007 government approval was finally given for the development of a new football ground for Brighton and Hove Albion within the boundaries of the Sussex Downs AONB, after a fierce fight by conservationists. The subsequent development, known as Falmer Stadium, was officially opened in July 2011. The Weymouth Relief Road in Dorset was constructed between 2008 and 2011, after environmental groups lost a High Court challenge to prevent its construction.
Writing in 2006, Professor Adrian Phillips listed threats facing AONBs. He wrote that the apparent big threats were uncertainty over future support for land management, increasing development pressures, the impacts of globalization, and climate change. More subtle threats include creeping sub-urbanization and "horsiculture".
Poet Laureate Simon Armitage wrote a poem "Fugitives", commissioned by the National Association of AONBs, which he read on Arnside Knott on 21 September 2019 to launch the celebration of the 70th anniversary of the National Parks and Access to the Countryside Act.
|Arnside and Silverdale||1972||75 km2 (29 sq mi)||Cumbria (South Lakeland), Lancashire (Lancaster)|
|Blackdown Hills||1991||370 km2 (140 sq mi)||Devon (East Devon, Mid Devon), Somerset (South Somerset, Somerset West and Taunton)|
|Cannock Chase||1958||68 km2 (26 sq mi)||Staffordshire (Cannock Chase, Lichfield)|
|Chichester Harbour||1964||37 km2 (14 sq mi)||Hampshire (Havant), West Sussex (Chichester)|
|Chiltern Hills||1965||833 km2 (322 sq mi)||Buckinghamshire, Central Bedfordshire, Hertfordshire (Dacorum, North Hertfordshire, Three Rivers), Luton, Oxfordshire (South Oxfordshire)|
|Cornwall||1959||958 km2 (370 sq mi)||Cornwall|
|Cotswolds||1966||2,038 km2 (787 sq mi)||Bath and North East Somerset, Gloucestershire (Cheltenham, Cotswold, Stroud, Tewkesbury), Oxfordshire (Cherwell, West Oxfordshire), South Gloucestershire, Warwickshire (Stratford-on-Avon), Wiltshire, Worcestershire (Wychavon)|
|Cranborne Chase and the West Wiltshire Downs||1981||983 km2 (380 sq mi)||Dorset, Hampshire (New Forest), Somerset (Mendip, South Somerset), Wiltshire|
|Dedham Vale||1970||90 km2 (35 sq mi)||Essex (Colchester, Tendring), Suffolk (Babergh)|
|Dorset||1959||1,129 km2 (436 sq mi)||Dorset|
|East Devon||1963||268 km2 (103 sq mi)||Devon (East Devon)|
|Forest of Bowland||1964||803 km2 (310 sq mi)||Lancashire (Lancaster, Pendle, Ribble Valley, Wyre), North Yorkshire (Craven)|
|High Weald||1983||1,460 km2 (560 sq mi)||East Sussex (Hastings, Rother, Wealden), Kent (Ashford, Sevenoaks, Tonbridge and Malling, Tunbridge Wells), Surrey (Tandridge), West Sussex (Crawley, Horsham, Mid Sussex)|
|Howardian Hills||1987||204 km2 (79 sq mi)||North Yorkshire (Hambleton, Ryedale)|
|Isle of Wight||1963||189 km2 (73 sq mi)||Isle of Wight|
|Isles of Scilly||1975||16 km2 (6.2 sq mi)||Isles of Scilly|
|Kent Downs||1968||878 km2 (339 sq mi)||Greater London (Bromley), Kent (Ashford, Canterbury, Dover, Folkestone & Hythe, Gravesham, Maidstone, Sevenoaks, Swale, Tonbridge and Malling), Medway|
|Lincolnshire Wolds||1973||560 km2 (220 sq mi)||Lincolnshire (East Lindsey, West Lindsey), North East Lincolnshire|
|Malvern Hills||1959||105 km2 (41 sq mi)||Gloucestershire (Forest of Dean), Herefordshire, Worcestershire (Malvern Hills)|
|Mendip Hills||1972||200 km2 (77 sq mi)||Bath and North East Somerset, North Somerset, Somerset (Mendip, Sedgemoor)|
|Nidderdale||1994||603 km2 (233 sq mi)||North Yorkshire (Hambleton, Harrogate, Richmondshire)|
|Norfolk Coast||1968||453 km2 (175 sq mi)||Norfolk (Great Yarmouth, King's Lynn and West Norfolk, North Norfolk)|
|North Devon Coast||1959||171 km2 (66 sq mi)||Devon (North Devon, Torridge)|
|North Pennines||1988||1,983 km2 (766 sq mi)||County Durham, Cumbria (Carlisle, Eden), Northumberland, North Yorkshire (Richmondshire)|
|Northumberland Coast||1958||138 km2 (53 sq mi)||Northumberland|
|North Wessex Downs||1972||1,730 km2 (670 sq mi)||Hampshire (Basingstoke and Deane, Test Valley), Oxfordshire (South Oxfordshire, Vale of White Horse), Swindon, West Berkshire, Wiltshire|
|Quantock Hills||1956||98 km2 (38 sq mi)||Somerset (Sedgemoor, Somerset West and Taunton)|
|Shropshire Hills||1958||802 km2 (310 sq mi)||Shropshire, Telford and Wrekin|
|Solway Coast||1964||115 km2 (44 sq mi)||Cumbria (Allerdale, Carlisle)|
|South Devon||1960||337 km2 (130 sq mi)||Devon (South Hams), Plymouth, Torbay|
|Suffolk Coast and Heaths||1970||403 km2 (156 sq mi)||Suffolk (Babergh, East Suffolk)|
|Surrey Hills||1958||422 km2 (163 sq mi)||Surrey (Guildford, Mole Valley, Reigate and Banstead, Tandridge, Waverley)|
|Tamar Valley||1995||190 km2 (73 sq mi)||Cornwall, Devon (South Hams, West Devon)|
|Wye Valley (partly in Wales)||1971||326 km2 (126 sq mi)||Gloucestershire (Forest of Dean), Herefordshire, Wales: Monmouthshire|
|Total||19,035 km2 (7,349 sq mi)|
The establishment of the New Forest National Park in 2005 meant the subsumption of South Hampshire Coast AONB into it. East Hampshire and Sussex Downs AONBs were replaced in 2010 by the South Downs National Park.
Main article: Areas of Outstanding Natural Beauty in Wales
|AONB / AHNE||Photo||Established||Area||Local authorities|
|1967||221 km2 (85 sq mi)||Anglesey|
|Clwydian Range and Dee Valley
(Bryniau Clwyd a Dyffryn Dyfrdwy)
|1985||389 km2 (150 sq mi)||Denbighshire, Flintshire, Wrexham|
|1956||188 km2 (73 sq mi)||Swansea|
|Llŷn||1956||155 km2 (60 sq mi)||Gwynedd|
(partly in England)
|1971||326 km2 (126 sq mi)||Monmouthshire,|
|Antrim Coast and Glens||1989||724 km2 (280 sq mi)||Causeway Coast and Glens, Mid and East Antrim|
|Binevenagh||1966[a]||138 km2 (53 sq mi)||Causeway Coast and Glens|
|Causeway Coast||1989||42 km2 (16 sq mi)||Causeway Coast and Glens|
|Lagan Valley||1965||39 km2 (15 sq mi)||Belfast, Lisburn and Castlereagh|
|Mourne Mountains||1986||570 km2 (220 sq mi)||Armagh City, Banbridge and Craigavon, Newry, Mourne and Down|
|Ring of Gullion||1966[b]||154 km2 (59 sq mi)||Newry, Mourne and Down|
|Sperrins||1968||1,181 km2 (456 sq mi)||Causeway Coast and Glens, Derry and Strabane, Fermanagh and Omagh, Mid Ulster|
|Strangford and Lecale||1967[c]||525 km2 (203 sq mi)||Ards and North Down, Newry, Mourne and Down|
For proposed areas in Wales, see Areas of Outstanding Natural Beauty in Wales § Proposed areas.
The following are formal proposals for new AONBs submitted to Natural England:
The 2019 Landscape Review Report additionally favourably mentions proposals not listed in Natural England's list: from Sandstone Ridge and the Vale of Belvoir.