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The South Downs is one of the four areas of chalk downland in southern England. They extend from the eastern side of Hampshire through Sussex, culminating in the cliffs at Beachy Head.
The South Downs is England's newest National Park, its designation taking effect on March 31, 2010. There are many Sites of Special Scientific Interest within the park.
The area is relatively unpopulated, although along its southern periphery there is an almost uninterrupted ribbon of seaside towns. It is extremely popular with walkers, having one principal long distance footpath, the South Downs Way, and many interconnecting ones. There are three principal gaps in the upland through which rivers flow; and there are also many dry valleys along its length.
The South Downs have a long history; there are archaeological remains from Neolithic times. Until the middle of the 20th century, sheep-rearing was the main occupation of those living on the Downs.

At 886ft, Butser Hill is the highest point of the South Downs.

Extract from Wikipedia Link

The National Cycle Network is a network of cycle routes. It was created by the charity Sustrans Link (Sustainable Transport), aided by a National Lottery grant.

Many routes aim to minimise contact with motor traffic, though 70% of them are on roads. In some cases the NCN uses pedestrian routes, disused railways, minor roads, canal towpaths, or traffic-calmed routes in towns and cities.

National Cycle Route 22 (NCR22) runs 92 miles from Banstead to Brockenhurst in the New Forest via Dorking, Guildford, Farnham, Petersfield, Havant, Portsmouth, Ryde, Yarmouth and Lymington. Due to the route going over the Isle of Wight, ferry connections are required from Portsmouth to Ryde, and again from Yarmouth to Lymington.

The Sussex Border Path is a footpath route nearly 150 miles long around the inland boundary of the county of Sussex. The county owes its origins to the kingdom of the South Saxons and can claim to have one of the longest inland county boundaries from Emsworth to Rye. The route was devised in 1983 and is well signed along most of the route. Website Link
Map: Link