- Amberley Wild Brooks Type: Nature Reserve Contact: | Address: | Phone: 01273 492630 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=10 A large area of flood meadows, one of the richest wetlands remaining in SE England. Much of it is a Sussex Wildlife Trust nature reserve
- Arundel Wildfowl and Wetlands Centre Type: Nature Reserve Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=357 A mixture of exotic captive waterfowl and a reedbed nature reserve with good access all round. Visitor centre with teashop.
- Beachy Head Type: Nature Reserve | Location: Eastbourne Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=104 The highest chalk cliffs in the UK, some 150m high, with an iconic lighthouse at the cliff base. There is a visitor centre and public toilets.
- Beacon Hill National Nature Reserve Type: Nature Reserve | Location: Warnford Contact: | Address: Hampshire | Phone: 023 802 6410 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=51 Excellent chalk grassland looking over the Meon Valley towards Old Winchester Hill to the east and the sea to the south - well worth a short detour.
- Burton and Chingford Ponds Local Nature Reserve Type: Nature Reserve | Location: Duncton Contact: | Address: West Sussex | Phone: 01273 492630 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=80 Nature reserve with lakes full of wildfowl, nature trail through woods and wet heath areas, and the (in)famous Black Hole bog.
- Castle Hill National Nature Reserve Type: Nature Reserve Contact: | Address: | Phone: 01273 476595 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=48 Chalk grassland nature reserve. Its speciality is Early Spider Orchid.
- Cissbury Ring Type: Nature Reserve Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=106 The Iron Age hill fort on top of this prominent hill can be seen from the Trail. Less obvious is its pitted surface, the remains of a large scale flint Neolithic mining industry.
- Devils Dyke Type: Nature Reserve | Location: Poynings Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=53 Famous beauty spot just outside Brighton, with a pub, toilets, and splendid views. The Dyke itself is an Ice Age dry Valley.
- Ditchling Beacon Type: Nature Reserve Contact: | Address: | Phone: 01273 492630 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=112 There is a fine viewpoint from the top of the hill at this Sussex Wildlife Trust nature reserve. There is usually an ice cream van in the National Trust car park.
- Eastbourne Pound Type: Nature Reserve | Location: Eastbourne Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=4 A 5ha rock pool full of marine life, great for snorkelling or just rock pooling with a net. Beach cafe.
- Graffham Downland nature reserves Type: Nature Reserve | Location: Graffham Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=95 Several small nature reserves just off the Trail, ideal for a picnic or just to explore
- Harting Downs Type: Nature Reserve | Location: South Harting Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=9 A large area of chalk grassland with stands of wild juniper. There are also prehistoric remains including cross dykes and a hill fort
- Heyshott Down Nature Reserve Type: Nature Reserve | Location: Heyshott Contact: | Address: Sussex | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=82 Neolithic and Bronze Age earthworks on a chalk grassland nature reserve
- Levin Down Nature Reserve Type: Nature Reserve | Location: Singleton Contact: | Address: Chichester Sussex | Phone: 01273 492630 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=20 A south facing area of chalk grassland with juniper and the largest surviving area of chalk heath in West Sussex.
- Lullington Heath National Nature Reserve Type: Nature Reserve | Location: Wilmington Contact: | Address: | Phone: 01273 476595 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=47 Chalk grassland nature reserve, grazed by free ranging goats. Includes the largest remaining areas of chalk heath in the South Downs.
- Malling Downs nature reserve Type: Nature Reserve | Location: Lewes Contact: | Address: | Phone: 01273 492630 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=38 Extensive open access chalk grassland, owned by Sussex Wildlife Trust.
- Mill Hill nature reserve Type: Nature Reserve Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=2 A Butterfly reserve with fine views up and down the Adur valley
- Mount Cayburn Type: Nature Reserve | Location: Glynde Contact: | Address: | Phone: 01273 476595 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=72 Iron Age hill fort and National Nature Reserve.
- Newtimber Hill Type: Nature Reserve Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=360 A large area of open access chalk grassland with superb views. Owned by the National trust.
- Old Winchester Hill National Nature Reserve Type: Nature Reserve Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=404 Nature reserve with the best preserved Iron Age hill fort on the SDW.
- Queen Elizabeth County Park Type: Nature Reserve | Location: Petersfield Contact: | Address: Gravel Hill Horndean Hampshire | Phone: 023 92595040 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=73 Large Country Park with extensive areas of chalk grassland, yew woods, beech plantation, visitor centre, café, and shop. Includes Butser Hill, 270m above sea level with great views in all directions.
- Queen Elizabeth County Park Type: Nature Reserve | Location: Petersfield Contact: | Address: Gravel Hill Horndean Hampshire | Phone: 023 92595040 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=73 Large Country Park with extensive areas of chalk grassland, yew woods, beech plantation, visitor centre, café, and shop. Includes Butser Hill, 270m above sea level with great views in all directions.
- RSPB Pulborough Brooks Type: Nature Reserve Contact: | Address: | Phone: 01798 875851 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=14 A major RSPB reserve, good all year round for wetland birds.
- Seven Sisters Type: Nature Reserve | Location: East Dean Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=109 The most famous and beautiful section of the whole Trail, where the rolling hills meet the sea in stunning white chalk cliffs. The sisters are the valleys - there are eight hills.
- Seven Sisters Country Park Type: Nature Reserve | Location: Exceat Contact: | Address: | Phone: 01323-871095 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=393 Country Park on main bus route; pay car park, toilets, cafe, visitor centre, bike hire, drinking water tap.
- St. Catherines Hill Type: Nature Reserve | Location: Winchester Contact: | Address: | Phone: 01489 774400 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=101 Superb chalk grassland nature reserve and hill fort overlooking Winchester
- The mouth of the Cuckmere Type: Nature Reserve | Location: Exceat Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=107 The last undeveloped river mouth on the Sussex coast, and a great place for a swim or a spot of rock pooling.
- Waltham Brooks Type: Nature Reserve Contact: | Address: | Phone: 01273 492630 http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=55 Floodmeadows by the side of the Arun, a Sussex Wildlife Trust nature reserve.
- Woolstonbury Hill Type: Nature Reserve Contact: | Address: | Phone: http://www.nationaltrail.co.uk/southdownssite.asp?PageId=26&SiteId=78 National Trust land with fine views