The Little Ouse Valley between Brandon and Thetford has been designated a Forest Nature Reserve by the Forestry Commission in recognition of its importance to wildlife.
Along the valley, wetland areas of alder carr and fen, poplars, damp grazing meadows and reedbeds support a rich variety of plants, insects and birds. St Helen's picnic site, next to the river, is a good base from which to explore.
Following the Orange Walk you will pass a number of informative panels, some of general interest and some with more historical and ecological interest. An impressive display of snowdrops can be seen at Santon Downham in the early spring in the woodland opposite the village shop.