National nature reserves in Wales are administered by Natural Resources Wales (formerly the Countryside Council for Wales). There are 67 reserves.
(Gwynedd, Conwy, Wrexham, Flintshire and Denbighshire)
(Ceredigion, north Powys, north Carmarthenshire)
(Pembrokeshire, south Carmarthenshire, Bridgend, south Powys, Swansea, Monmouthshire and the county boroughs of the South Wales valleys)