Located on the southern edge of the Marlborough Downs, Fyfield Down Nature Reserve is an ancient landscape, untouched by the modern plough. It forms part of a host of National Nature Reserves, located throughout the country.

A prominent feature within the area, in the form of 25,000 sarsen boulders, is the remains of an eroded silicrete sheet left over from geological activity 20 million years ago. The stones lay scattered all around, being mostly concentrated on the valley floor. They are sometimes refered to as "grey wethers", which in Old English translates as grey sheep.

The area is home to a varied array of wildlife, including many species of lichens which grow on the stones. Wild grasses such as Crested Dog's Tail and Red Fescue can be found on the infertile soils at the reserve. Herbs such as Salad Burnet and Lady's Bedstraw are also to be found there. Birds can be seen throughout, although as with many downland areas they can be spread thinly. Meadow Pipit, Yellowhammer and Skylark can be seen year round; Whinchat, Wheatear and Ring Ouzel may make an appearance during Spring and Autumn. The commoner finch and tit species typically occupy the trees and hedgerows. An early evening visit may produce a Barn Owl, hunting among the grasses for small mammals.

There are a number of footpaths leading to the reserve, including the Ridgeway, which runs along the western edge. If you approach from the footpath off the A4 near Clatford you will pass "The Devil's Den", the remains of a prehistoric burial chamber, reconstructed in the 1920's. At the northern end of the reserve can be found (with some searching) "The Polisher Stone", another prehistoric artifact. Its usage is uncertain but it was most probably for polishing flint tools.

There is a carpark on the eastern side which can be reached from the minor road at Manton, just outside Marlborough. Alternatively, footpaths run from Avebury, Clatford, Rockley and the Ridgeway.