List of Sites of Special Scientific Interest in Ceredigion

This is a list of the Sites of Special Scientific Interest (SSSIs) in the Ceredigion Area of Search (AOS).

[2] The Areas of Search were conceived and developed between 1975 and 1979 by the Nature Conservancy Council (NCC), based on regions created by the Local Government Act 1972.

The NCC created 12 Welsh Areas of Search; they mostly follow county borders, but the larger counties (Dyfed, Powys and Gwynedd) were divided into multiple Areas using district borders.

Due to subsequent local government reorganisation in the UK since 1972, many counties and districts have been divided, merged or renamed.

Using the AOS system alone would make it difficult to search for individual SSSI citations via the Countryside Council for Wales (CCW) database without knowing 1972 region divisions.