The source of the stream is in the Charnock area of the city, where it flows south, crossing the border into Derbyshire.
[3] Two areas along the course of the stream are part of the Moss Valley Meadows Site of Special Scientific Interest (SSSI).
The site is located mainly on the southern bank of the Robin Brook, with the clearings in the trees supporting a meadow habitat.
[4] The three areas are all north-facing, with neutral to acidic soils, and are populated by a rich variety of grassland animals and plants.
They are one of the best preserved areas of semi-natural woodland in north east Derbyshire, and include several species which are either local or rare.