This is a list of the Areas of Special Scientific Interest (ASSIs) in Northern Ireland, United Kingdom. In Northern Ireland the body responsible for designating ASSIs is the Northern Ireland Environment Agency - a division of the Department of Environment (DoE).
Unlike the SSSIs, ASSIs include both natural environments and man-made structures. As with SSSIs, these sites are designated if they have criteria based on fauna, flora, geological or physiographical features. On top of this, structures are also covered, such as the Whitespots mines in Conlig, according to several criterion including rarity, recorded history and intrinsic appeal.[1]
For other sites in the rest of the United Kingdom, see List of SSSIs by Area of Search.
| Site name | Reason for Designation | Area | Council | Year confirmed | Map | ||||
| Biological Interest | Geological Interest | Historical or Cultural Interest | Hectares | Acres | |||||
| Aghabrack ASSI304 | Strabane | 2009 | |||||||
| Aghanloo Wood ASSI228 | 36.84 | 91.04 | Limavady | 2004 | |||||
| Aghnadarragh | 1.42 | 3.51 | Antrim | 2004 | |||||
| Altikeeragh NNR048 | n/a | n/a | Coleraine | 2002 | |||||
| Altikeeragh ASSI171 | 73.04 | 180.48 | Coleraine | 1999 | |||||
| Altmover Glen | 12.5 | 31 | Limavady | 1994 | |||||
| Annachullion Lough | 3.68 | 9.1 | Fermanagh | 1997 | |||||
| Annacramph Meadows | 1.01 | 2.5 | Armagh | 1992 | |||||
| Antrim Hills | 10,964.19 | 27,093.12 | Ballymena | 2006 | |||||
| Aughnadarragh Lough ASSI149 | 5.18 | 12.8 | Ards | 1999 | |||||
| Aughnadarragh Lough SAC045 | 5.18 | 12.8 | Ards | 2005 | |||||
| Ballybannan | 0.59 | 1.47 | Down | 1997 | |||||
| Ballycam | 1.21 | 3 | Down | 1997 | |||||
| Ballycarry | 17.4 | 43 | Moyle | 1992 | |||||
| Ballycastle Coalfield | 27.68 | 68.4 | Moyle | 1998 | |||||
| Ballygill North | 31.57 | 78 | Moyle | 1992 | |||||
| Ballykilbeg ASSI153 | 15.21 | 37.59 | Down | 1998 | |||||
| Ballykilbeg SAC044 | 15.21 | 37.59 | Down | 2005 | |||||
| Ballyknock | 3.07 | 7.58 | Magherafelt | 1999 | |||||
| Ballymacaldrack | 1.01 | 2.5 | Ballymoney | 2007 | |||||
| Ballymacallion | 9.12 | 22.54 | Limavady | 2007 | |||||
| Ballymaclary | n/a | n/a | Coleraine | 1976 | |||||
| Ballymacombs More | 11.12 | 27.48 | Magherafelt | 2005 | |||||
| Ballymacormick Point | 15.78 | 39 | North Down | 1988 | |||||
| Ballynagross Lower | 3.1 | 7.67 | Down | 1997 | |||||
| Ballynahone Bog SAC001 | 98.44 | 243.24 | Magherafelt | 2005 | |||||
| Ballynahone Bog RSAR009 | 98.44 | 243.24 | Magherafelt | 1998 | |||||
| Ballynahone Bog NNR047 | n/a | n/a | Magherafelt | 2000 | |||||
| Ballynahone Bog ASSI010 | 98.74 | 244 | Magherafelt | 1995 | |||||
| Ballynanaghten | 0.48 | 1.19 | Lisburn | 2001 | |||||
| Ballypalady | 1.62 | 4.01 | Antrim | 2005 | |||||
| Ballyquintin Point NNR040 | n/a | n/a | Ards | 1987 | |||||
| Ballyquintin Point ASSI087 | 29.99 | 74.1 | Ards | 1995 | |||||
| Ballyrisk More | 5.25 | 12.97 | Limavady | 2007 | |||||
| Ballysudden | 39.58 | 97.8 | Cookstown | 1997 | |||||
| Banagher | 2.07 | 5.11 | Fermanagh | 2005 | |||||
| Banagher Glen ASSI064 | 38.04 | 94 | Limavady | 1994 | |||||
| Banagher Glen SAC023 | 35.52 | 87.77 | Limavady | 2005 | |||||
| Banagher Glen NR015 | n/a | n/a | Limavady | 1974 | |||||
| Bann Estuary SAC041 | 140.81 | 347.94 | Coleraine | 2005 | |||||
| Bann Estuary ASSI208 | 140.81 | 347.94 | Coleraine | 2001 | |||||
| Bardahessiagh | 3.88 | 9.6 | Cookstown | 1996 | |||||
| Beagh Big | 0.53 | 1.3 | Fermanagh | 1988 | |||||
| Belfast Lough RSAR006 | 174.88 | 432.14 | Belfast | 1998 | |||||
| Belfast Lough SPA010 | 174.88 | 432.14 | Belfast | 1998 | |||||
| Belfast Lough Open Water | n/a | n/a | n/a | 2006 | |||||
| Bellanaleck | 0.38 | 0.93 | Fermanagh | 1996 | |||||
| Belshaws Quarry | n/a | n/a | Lisburn | 1972 | |||||
| Benburb | 1.21 | 3 | Dungannon & South Tyrone | 1995 | |||||
| Binevenagh NNR041 | n/a | n/a | Limavady | 1987 | |||||
| Binevenagh SAC039 | 36.74 | 90.79 | Limavady | 2005 | |||||
| Binevenagh ASSI212 | 36.74 | 90.79 | Limavady | 2001 | |||||
| Black Bog RSAR015 | 74.23 | 183.42 | Omagh | 1999 | |||||
| Black Bog SAC002 | 74.23 | 183.42 | Omagh | 2005 | |||||
| Black Bog ASSI007 | 78.51 | 194 | Omagh | 1987 | |||||
| Black Burn | 8.22 | 20.3 | Larne | 1997 | |||||
| Black Lough ASSI239 | 2.62 | 6.47 | Dungannon & South Tyrone | 2004 | |||||
| Black Lough ASSI154 | 18.03 | 44.55 | Down | 1998 | |||||
| Bohill Forest | n/a | n/a | Down | 1970 | |||||
| Boho | 5.77 | 14.25 | Fermanagh | 1999 | |||||
| Bonds Glen | 20.46 | 50.56 | Derry City | 2004 | |||||
| Boorin | n/a | n/a | Strabane | 1975 | |||||
| Bovevagh | 2.31 | 5.7 | Limavady | 1995 | |||||
| Braade | 1.17 | 2.9 | Fermanagh | 1996 | |||||
| Brackagh Moss | n/a | n/a | Craigavon | 1976 | |||||
| Breen Forest | n/a | n/a | n/a | 1970 | |||||
| Breen Wood SAC024 | 14.57 | 36.01 | n/a | 2005 | |||||
| Breen Wood ASSI161 | 14.57 | 36 | Moyle | 1997 | |||||
| Burdautien Lough | 2.63 | 6.5 | Fermanagh | 1995 | |||||
| Caldanagh Bog | 14.37 | 35.5 | Ballymoney | 1997 | |||||
| Cam Lough | 33.05 | 81.66 | Newry & Mourne | 2004 | |||||
| Carlingford Lough SPA009 | 334.72 | 827.12 | Newry & Mourne | 1998 | |||||
| Carlingford Lough RSAR005 | n/a | n/a | Newry & Mourne | n/a | |||||
| Carn/Glenshane Pass ASSI167 | 784.6 | 1,938.78 | Coleraine | 2000 | |||||
| Carn/Glenshane Pass SAC033 | 784.6 | 1,938.78 | Coleraine | 2005 | |||||
| Carrickarede ASSI113 | 9.2 | 22.73 | Coleraine | 1997 | |||||
| Carrickastickan | 1.51 | 3.74 | Newry & Mourne | 2002 | |||||
| Carrickbrawn | 4.86 | 12 | Fermanagh | 1987 | |||||
| Carrowcarlin | 3.17 | 7.84 | Down | 1998 | |||||
| Cashel Loughs | 13.84 | 34.21 | Newry & Mourne | 1998 | |||||
| Copeland Islands | 81.55 | 201.52 | Ards | 2004 | |||||
| Devenish Island | 26 | 64.24 | Fermanagh | 2007 | |||||
| Giant's Causeway and Dunseverick | 91.59 | 226.33 | Moyle | 2000 | |||||
| Whitespots | 2.04 | 5.05 | Ards | 1999 | |||||
Rounded to two decimal places.
As yet unconfirmed. Year displayed is year of declaration.