• National nature reserves in Wales (1 C, 65 P)

A

• Sites of Special Scientific Interest on Anglesey (25 P)

B

• Sites of Special Scientific Interest in Brecknock (1 C, 28 P)
• Sites of Special Scientific Interest in Bridgend County Borough (7 P)

C

• Sites of Special Scientific Interest in Caerphilly County Borough (5 P)
• Sites of Special Scientific Interest in Cardiff (8 P)
• Sites of Special Scientific Interest in Carmarthen & Dinefwr (92 P)
• Sites of Special Scientific Interest in Ceredigion (28 P)
• Sites of Special Scientific Interest in Clwyd (63 P)

E

• Sites of Special Scientific Interest in East Gwynedd (11 P)

F

• Sites of Special Scientific Interest in Flintshire (3 P)

G

• Sites of Special Scientific Interest in Gwent (1 P)

M

• Sites of Special Scientific Interest in Merthyr Tydfil County Borough (5 P)
• Sites of Special Scientific Interest in Mid & South Glamorgan (6 C, 18 P)
• Sites of Special Scientific Interest in Monmouthshire (23 P)
• Sites of Special Scientific Interest in Montgomery (4 P)

N

• Sites of Special Scientific Interest in Newport (4 P)

P

• Sites of Special Scientific Interest in Pembrokeshire (37 P)
• Sites of Special Scientific Interest in Powys (1 C, 2 P)

R

• Sites of Special Scientific Interest in Rhondda Cynon Taf (10 P)

V

• Sites of Special Scientific Interest in the Vale of Glamorgan (13 P)

W

• Sites of Special Scientific Interest in West Glamorgan (1 C, 15 P)
• Sites of Special Scientific Interest in West Gwynedd (22 P)

• List of Sites of Special Scientific Interest in Wales

B

• List of Sites of Special Scientific Interest in Blaenau Gwent
• List of Sites of Special Scientific Interest in the Brecon Beacons National Park

C

• List of Sites of Special Scientific Interest in Cardiff
• List of Sites of Special Scientific Interest in Carmarthenshire
• List of Sites of Special Scientific Interest in Conwy County Borough

D

• List of Sites of Special Scientific Interest in Denbighshire

F

• List of Sites of Special Scientific Interest in Flintshire

G

• List of Sites of Special Scientific Interest in Gwynedd

I

• List of Sites of Special Scientific Interest in Anglesey

L

• List of Sites of Special Scientific Interest in Ceredigion

M

• List of Sites of Special Scientific Interest in Monmouthshire

N

• List of Sites of Special Scientific Interest in Neath Port Talbot
• List of Sites of Special Scientific Interest in Newport

P

• List of Sites of Special Scientific Interest in Pembrokeshire
• Pencoedtre
• List of Sites of Special Scientific Interest in Powys

S

• List of Sites of Special Scientific Interest in Swansea

T

• List of Sites of Special Scientific Interest in Torfaen

V

• List of Sites of Special Scientific Interest in the Vale of Glamorgan

W

• List of Sites of Special Scientific Interest in Wrexham County Borough