Knettishall Heath is one of the club’s longest standing and most popular areas and has staged many colour-coded events. It contains an interesting variety of "runnable" mixed woodland and open heathlands sloping down to the River Ouse between Diss and Thetford. There is plenty of vegetation detail and a good path network. The numerous surface features include shallow pits from chalk & gravel extraction & from an early brick works, traces of odd-shaped excavations resulting from military training in the area, & low earth banks marking out the perimeters of early plantations. "Hut Hill" is a bronze age round barrow, while an odd circular area, known for some time as "The Warren" is now thought to be of a much earlier origin, unrelated to rabbit breeding, according to a recent archaeological survey.

After many year under local authority care the area is now owned by the Suffolk Wildlife Trust which is taking a more pro-active approach to management, including the removal of stretches of fencing & the clearance of small areas of woodland to produce corridors linking the three main areas of heathland. The old waste dump area to the south is also being managed as rough grassland. Information about the reserve can be found here.