The Best Nature Reserves in Sussex
Sussex is one of the most ecologically diverse counties in South East England, from the chalk cliffs of the South Downs to the shingle shores of Rye, there is a lot of nature and wildlife to see.
Whether you’re after quiet chalk down walks, birdwatching by the coast, or a butterfly-filled meadow in summer, Sussex has a reserve for you.
Here’s a guide to the top nature reserves in Sussex: perfect for walkers, photographers, and anyone looking to reconnect with nature.
Rye Harbour Nature Reserve (East Sussex)
Rye Harbour is on the Sussex coast, and features a vast landscape of shingle ridges, salt marsh and reedbeds. It’s the perfect place for bird watching, photography or a nice coastal walk.
It is managed by the Sussex Wildlife Trust, and is home to over 4,000 species of plants and animals, from little terns and avocets to seals. It also supports breeding birds like black-headed gulls. Just head to the car park and explore for the day, you can also pop into the flagship visitor centre.
Seaford Head Nature Reserve (East Sussex)
The Seaford Head Nature Reserveis a mix of chalk cliffs and downland grassland, offering views over the Seven Sisters.
In the summer, the slopes are covered with wildflower meadows and rare butterfly species.
Malling Down & Southerham Farm - Wildlife Trust (Lewes, East Sussex)
These adjoining reserves on the edge of Lewes showcase some of the best chalk grassland in southern England. Expect orchids, skylarks, and sweeping views of the Ouse Valley.
It’s best to visit in June or July when wildflowers are at their best.
Weir Wood Reservoir Nature Reserve (East Grinstead, East Sussex)
This tranquil reservoir, part of an Area of Outstanding Natural Beauty, supports rich birdlife including kingfishers, great crested grebes, and occasionally osprey.
The western end has public access and great viewing points.
Kingley Vale National Nature Reserve (West Sussex)
Famous for its ancient yew forest (with some of these ancient trees estimated at over 500 years old!) Kingley Vale is a great spot in the South Downs. If you can climb to the top, it offers panoramic views of Chichester Harbour.
Pagham Harbour Local Nature Reserve (West Sussex)
This large tidal inlet and salt marsh is an internationally important site for migratory birds. Thousands of wintering wildfowl and waders gather here in winter, while in summer you might see terns, avocets, and butterflies along the footpaths.
Pulborough Brooks (West Sussex)
Managed by the RSPB, Pulborough Brooks offers a mosaic of floodplain meadows, pools, and woodland. Expect nightingales, lapwings, dragonflies, and deer.
Castle Hill National Nature Reserve (Near Brighton, East Sussex)
Castle Hill, tucked just inland from Brighton, is one of the best remaining chalk downlands in southern England. It’s a hotspot for orchids, marbled white butterflies, and skylarks. Go in the summer for the best wildflower displays.
Warnham Deer Park
Set within the historic grounds of the Warnham Estate, Warnham Deer Park is a beautiful expanse of rolling parkland, ancient oaks, and tranquil lakes just outside Horsham. Once part of the 16th-century Warnham Court estate, the park has long been home to a managed herd of fallow deer, which can often be seen grazing in open glades or sheltering beneath veteran trees.
Warnham Local Nature Reserve
This nature reserve is located near Horsham and features a 17-acre millpond that is surrounded by islands, reedbeds and vegetation. It includes habitats like wet grasslands and willow carr that flood in the winter. This area supports over 3,000 species, including 100 bird species and 21 species of dragonflies.
Ashdown Forest
Sprawling across more than 6,500 hectares in the High Weald Area of Outstanding Natural Beauty, Ashdown Forest is one of the largest stretches of open heathland in southern England, and the real-life inspiration for A. A. Milne’s Winnie-the-Pooh stories. Its rolling heaths, wooded valleys, and quiet ponds make it a haven for wildlife. In spring and summer, the forest comes alive with nightjars, tree pipits, woodlarks, and dartford warblers, while fallow and roe deer are often seen at dawn or dusk.
Mens Nature Reserve
The Mens is an area of ancient woodland - it's rich in wildlife and hosts woodpeckers and nightingales. It is located near Billingshurst.
Piley Island
Piley Island is a 44-acre local nature reserve in West Sussex. The island consists of sand dunes, mudflats, vegetated shingle and salt marshes. There are many plants, insects and spiders. There is no public access to this island.
