The North Wessex Downs National Landscape is located in the English counties of Berkshire, Hampshire, Oxfordshire and Wiltshire. The name North Wessex Downs is not a traditional one, the area covered being better known by various overlapping local names, including the Berkshire Downs, the North Hampshire Downs, the White Horse Hills, the Lambourn Downs, the Marlborough Downs, the Vale of Pewsey and Savernake Forest.

Walbury Hill is a summit of the North Wessex Downs in Berkshire, England. With an elevation of 297 metres (974 ft), it is the highest natural point in South East England. On the hill's summit is the Iron Age hill fort of Walbury Camp, whilst the flanks of the hill lie within the Inkpen and Walbury Hills SSSI. The hill is one of three nationally important chalk wild grasslands in the North Wessex Downs, the others being in the Rushmore and Conholt Downs SSSI and the Hog's Hole SSSI. The summit of the hill is marked by a triangulation pillar, but lies on private land with no public access, although public access is available to the north of the summit via a byway.