Original sentence: The deep gorges which define its northern and southern edges are designated as special areas of conservation or 'SACs' on account of their thick oak and ash woodlands which shelter important bryophyte communities, in particular certain species of moss.The woodlands are also designated as sites of special scientific interest or 'SSSIs'
Edited sentence: The deep gorges which define its northern and southern edges are designated as a part of the 'Coedydd Nedd a Mellte' (Neath & Mellte Woodlands) special area of conservation or 'SAC' on account of their thick oak and ash woodlands which shelter important bryophyte communities, in particular certain species of moss.The woodlands are also designated as a part of the 'Dyffrynoedd Nedd a Mellte a Moel Penderyn' (Neath & Mellte Valleys and Moel Penderyn) site of special scientific interest or 'SSSI'