What is a Site of Special Scientific Interest? Sites of Special Scientific Interest (SSSIs) are sites in England and Wales which are given legal protection under the Wildlife and Countryside Act 1981 (WCA 1981), in recognition of their special interest by reason of their flora, fauna, geological or physiographical features. Natural England or Natural Resources Wales are responsible for designating such sites under WCA 1981, s 28. SSSIs can include wetlands, rivers, meadows, beaches and peat bogs. The owners of SSSIs are restricted in what they can do to and on the land and must not carry out, or cause or permit to be carried out, any operation specified in the notification unless the requirements of WCA 1981, s 28E are satisfied. Section 28G authorities are also under a duty, when exercising functions in a way likely to affect the relevant features, to take reasonable steps, consistent with the proper exercise of their functions, to further the conservation and enhancement of the flora, fauna or geological or physiographical features by reason of which a site is of special