Seven Sisters Formally Declared England's New National Nature Reserve

England's newest protected landscape

On 19 March 2026, the Seven Sisters became England's newest National Nature Reserve. Natural England and the South Downs National Park Authority formally designated the site, covering 1,500 hectares of chalk cliffs, river valley, heath, and floodplain meadows — giving it the strongest legal protection available under English conservation law.

The reserve runs along the East Sussex coast between Seaford in the west and Eastbourne in the east, taking in the full clifftop sequence and the Cuckmere valley behind it. Despite their name, there are technically eight chalk peaks — Haven Brow, Short Brow, Rough Brow, Brass Point, Flagstaff Point, Flat Hill, Baily's Hill, and Went Hill Brow — each separated by a dry valley carved by meltwater streams at the end of the last ice age. The "Seven Sisters" name, rooted in Greek mythology, has simply outlasted the count.

What the cliffs are actually made of

The chalk here is roughly 85 million years old, formed on the floor of a warm shallow sea that once covered southern England. The main material is coccolithophores — single-celled algae that grew calcium carbonate plates around themselves as a kind of microscopic armour. When they died, those plates sank to the seabed in their trillions, slowly compacting into the pure white rock we see today. It took around 10,000 years to build just one metre of chalk. When you're looking at cliffs up to 150 metres tall, you're looking at roughly 1.5 million years of accumulated biological material.

The dark horizontal bands running through the white face are flint — formed from the silica remains of sponges and other marine organisms that pooled in the chalk sediment and hardened over millennia. Early humans prized it for tools and fire-starting; geologists still read the bands as markers of different periods in the ancient sea's history.

Unlike the White Cliffs of Dover, which are defended by sea walls and as a result are gradually greening with vegetation, the Seven Sisters are managed under a policy of natural retreat. Waves undercut the chalk at the base, gravity does the rest, and the face stays white. Current erosion rates run at around 22 to 60 centimetres per year, with occasional large collapses after winter storms. The cliffs are bright because they are constantly falling.

Wildlife and habitat

Chalk grassland is one of the rarest habitats in the world — it takes centuries to develop and cannot be recreated once lost. Seven Sisters supports species including the chalkhill blue butterfly, bee orchid, yellowhammer, skylark, and the Adonis blue — a vivid, electric-blue butterfly that the NNR partnership has identified as a key target species for habitat recovery. The horseshoe vetch that both blue butterflies depend on grows only on closely grazed chalk downland; managing grazing pressure across 1,500 hectares is a central part of what the partnership will coordinate.

The Cuckmere valley adds a completely different layer. The river meanders through flood meadows and saltmarsh before reaching the sea at Cuckmere Haven, creating habitat for waders and waterfowl that the clifftop chalk grassland cannot support. Redshank, ringed plover, and wigeon all use the lower valley — and the NNR partnership has identified each of them as species where active habitat management could meaningfully increase breeding numbers. The ringed plover, for instance, lays camouflaged eggs directly on the shingle beach; careful management of the shoreline during nesting season is essential for its return.

Birdwatching changes significantly by season. Early spring sees the departure of winter wildfowl — wigeon, teal, little grebes, and regular kingfishers along the river — as migration begins. Through April and May, warblers fill the scrubby valley bushes and waders including black-tailed godwits pass through the wetlands. Summer is ground-nesting season for skylark, meadow pipit, and wheatear on the downs; fulmars and kittiwakes hold the cliff faces. By winter, the flooded meadows host mixed flocks of wigeon, teal, and geese.

Beneath the grassland, the chalk formation holds one of Britain's largest aquifers — filtered rainwater that moves slowly through the rock over decades before emerging as the drinking supply for towns across the region. South East Water is one of the eight NNR partners precisely because how the land above is managed directly affects water quality below. The designation formalises that connection in a way the previous patchwork of arrangements did not.

Part of King Charles III's King's Series

Seven Sisters is the 13th National Nature Reserve in the King's Series — the halfway point in Natural England's commitment to create or expand 25 NNRs by 2028 with the backing of King Charles III. The 13 sites so far cover 17,000 hectares in total, roughly twice the area of Brighton, with around 1.4 million people living within 5km of at least one.

A landscape with a long history of being fought over

The cliffs have drawn artists, writers, and filmmakers for well over a century. Rudyard Kipling, who lived nearby at Bateman's in Burwash, described the landscape as "half-wild and wholly tame" in his poem Sussex. The cliffs appear in Atonement, Harry Potter and the Goblet of Fire, Robin Hood: Prince of Thieves, The Hitchhiker's Guide to the Galaxy, and the 2024 Wicked.

Less well known is the conservation battle that secured them in the first place. In 1926, a group of developers proposed building a new town on the clifftops. Opponents — including Kipling himself, local conservation groups, and members of the public — had just one month to raise £17,000 (around £509,000 today) to buy the land outright and stop the scheme. They succeeded. The designation announced this week builds on nearly a century of that accumulated effort.

How the reserve will be managed

Eight organisations will share responsibility: Natural England, Forestry England, the National Trust, Sussex Wildlife Trust, South Downs National Park Authority, South East Water, Eastbourne Borough Council, and Seaford Town Council. The breadth of that coalition reflects how many competing interests the site has to accommodate — conservation, water supply, public access, coastal safety, and local economic activity all operate across the same ground.

Getting there and what to do

Seven Sisters is car-free friendly. From London Victoria, take the Southern service towards Eastbourne or Seaford — journey time is around 1 hour 25 minutes. Buses run from Brighton, Seaford, and Eastbourne directly to the Visitor Centre at Exceat. There's no entry fee to the park.

The Visitor Centre at Exceat is the main starting point, with approximate walking times from there:

• Visitor Centre to the beach: 1 mile / 1.6km (around 30 minutes)
• Visitor Centre to Coastguard Cottages: 1.5 miles / 2.4km (around 40 minutes)
• Visitor Centre to Birling Gap: 3.5 miles / 5.6km (2–3 hours)
• Visitor Centre to Beachy Head: 5 miles / 8km (3–4 hours)

The full Seaford-to-Eastbourne clifftop walk is around 14 miles, following the South Downs Way with several steep climbs and spectacular views of Cuckmere Haven and Beachy Head lighthouse. For a shorter option, the Exceat to Birling Gap section is under two hours and gives you the best of the clifftop without the full commitment. Birling Gap has a National Trust café and steps down to the beach.

The valley floor is also worth exploring independently — flatter, sheltered, and well suited to families or anyone who prefers to avoid the cliff edge. A concrete track runs from the Visitor Centre to the coast, accessible for pushchairs and bikes. Cyclists are welcome on the valley floor, though the South Downs Way clifftop route is footpath only.

On the water: Buzz Active Cuckmere operates kayak, open canoe, and stand-up paddleboard hire on the Cuckmere meanders — the calm, meandering channels that run through the valley floor. You can hire by the hour. The meanders can also be accessed independently by canoe or paddleboard; the dedicated entry and exit point is the wharf in the South Car Park. No motorised craft are permitted.

Stargazing: In 2016, the South Downs National Park was designated an International Dark Sky Reserve — one of the largest in Europe. Seven Sisters Country Park is one of ten Dark Sky Discovery Sites within the park. On clear nights between October and March, the Milky Way is visible rising above the chalk cliffs. The lack of artificial lighting over the Channel makes the horizon unusually dark by UK standards.

The village of Alfriston, a mile inland up the Cuckmere valley, is worth a detour — occupied since the Saxon period, with one of the oldest National Trust properties in the country. Friston Forest, just north of the park, has mountain bike trails for more confident cyclists.

For more on things to do in the South East and across the UK, the Seven Sisters Country Park website has detailed visitor information, trail maps, and activity booking. If you're newly arrived in the UK and figuring out how to spend your weekends, our lifestyle directory has wider recommendations for leisure and outdoor activities across the country.

This article is based on the official press release published by Natural England and the Department for Environment, Food & Rural Affairs on 19 March 2026, available at GOV.UK under the Open Government Licence v3.0. Moving to the UK is an independent editorial site and is not affiliated with Natural England or any government body.