 Complete the following phrase:  Snowdonia has a particularly high number of protected sites in respect of its diverse ecology; nearly 20 of its total area is protected by UK and European law. Half of that area was set aside by the government under the European Habitats Directive as a Special Area of Conservation. There are a large number of Sites of special scientific interest or SSSIs, designated both for fauna and flora but also in some cases for geology. Nineteen of these sites are managed as national nature reserves by Natural Resources Wales. The park also contains twelve Special Areas of Conservation or SACs, three Special Protection Areas or SPAs and three 