The site is two narrow strips on either side of the Northampton loop railway line between Northampton and Rugby, with a tunnel connecting the strips. A stream runs along the north-east boundary. It is acid heathland, which is rare in the county. Birds include green woodpeckers and siskins, and there are butterflies such as brown arguses and speckled woods.[1]
There is access by footpaths from Harlestone Road through the Firs conifer plantation.
