North Downs

North Downs
ridge of chalk hills
The North Downs near Folkestone
Country	England
Counties	Kent, London, Surrey
Location	South-East England
Highest point
- location	Botley Hill
- elevation	267 m (876 ft)
Biome	Temperate broadleaf woodland
Geology	Chalk
Plants	Fagus sylvatica, Mercurialis perennis, Orchis purpurea, Brachypodium pinnatum
Animals	Kestrel, Adonis blue, hazel dormouse, badger

The North Downs are a ridge of chalk hills in south east England that stretch from Farnham in Surrey to the White Cliffs of Dover in Kent.Westerham Heights, at the northern edge of the North Downs, near Bromley, South London, is the highest point in London at an elevation of 245 m (804 ft). The North Downs lie within two Areas of Outstanding Natural Beauty (AONBs), the Surrey Hills and the Kent Downs. The North Downs Way National Trail runs along the North Downs from Farnham to Dover.

'Downs' is from Old English dun meaning, amongst other things, 'hill'. The word acquired the sense of 'elevated rolling grassland' around the fourteenth century. These hills are prefixed 'north' to distinguish them from the morphologically similar range of hills - the South Downs - which run roughly parallel to them but some 50 km (31 mi) to the south.

The narrow spine of the Hog's Back between Farnham and Guildford forms the western extremity of the North Downs, whilst the cliffs between Folkestone and Deal terminate the ridge in the east. There are two distinct aspects, the steep south-facing escarpment and the gentle north-facing dip slope. The southern boundary is defined by the foot of the escarpment which gives way to the flat, broad clay lands between the Downs and Greensand Ridge known as the Vale of Holmesdale. The northern boundary is less apparent but occurs where the chalk submerges below the more recent Paleocene deposits.