Lying within the Marlborough Downs, Fyfield Down Nature Reserve is a truly ancient landscape untouched by the modern plough. Within the area contains the remnants of an eroded silicrete sheet in the form of 25,000 sarsen boulders left over from geological activity 20 million years ago. Scattered all around the downs, the boulders create a unique landscape, which is home to some special and varied wildlife, particularly mosses and lichens. Wild grasses such as Crested Dog's Tail and Red Fescue can be found on the infertile soils at the reserve. Herbs including Salad Burnet and Lady's Bedstraw are also found here.

Fyfield Down is a great place for the rambler with footpaths running from many directions, including the nearby Ridgeway. It is also possible to deviate from the well-worn tracks in many parts and explore the landscape from a different angle. If you approach the downs 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.

A visit to the reserve should cater for the birdwatcher, although like all downland area the birds can be spread thinly. Meadow Pipit, Yellowhammer, Skylark and Stonechat can be seen year round. Spring and Autumn passage migrants such as Whinchat and Wheatear are often in attendance. The usual finch and tit species occupy the surrounding trees and hedgerows. An early evening visit may produce a Barn Owl, hunting amongst the grasses for small mammals.

Access to the reserve can be gained from many approaches. The best option by car is to make use of the car park near Manton House Stables. Alternatively there are footpaths from Avebury, Clatford, Rockley and the Ridgeway.