SSSI stands for "Site of Special Scientific Interest." It is a designation used in the United Kingdom to protect areas that are important for their wildlife, geology, or natural features. These sites are recognized for their unique ecological or geological characteristics, which contribute to the country's biodiversity and natural heritage. The designation of SSSI helps ensure that these areas are preserved and managed effectively. Landowners and managers are required to maintain the site's special features, and any activities that could harm the site may be restricted. This protection supports conservation efforts and promotes sustainable use of natural resources.