Three distinct locations in the valley have been designated as part of the Moss Valley Meadows SSSI, mainly along the side valley of the Robin Brook, one of the Moss' main tributaries. The northern section of the SSSI is the largest and consists of a large area of forest clearings in the Near Hill Clough Wood and the Far Hill Clough Wood immediately to the south of Charnock, a southern suburb of Sheffield; the site is located mainly on the southern bank of the Robin Brook, with the clearings in the trees supporting a meadow habitat. The central section of the SSSI is located further south along the Robin Brook, close to Hazlehurst Farm, in forest clearings in Parson's Wood and the neighborouring Joshua Holt woodland on the southern bank of the Robin Brook. The southern section of the SSSI is located in an area of open land just outside Geerlane, on the southern bank of the Moss where it is joined by the Robin Brook.