King Charles is set to inaugurate the King Charles III England Coast Path on Thursday, which when completed will allow walkers to walk over 2,700 miles of coastal paths. Before the inauguration, The King visited the Seven Sisters National Nature Reserve, marking a significant milestone in the ongoing effort to expand protected landscapes across England.The South Downs National Park Authority hosted a reception at the Salt Marsh Café, gathering local community members, charitable groups, and organisations instrumental in establishing the reserve.This stunning coastal site represents the 13th addition to the King’s Series of National Nature Reserves, an ambitious initiative targeting the creation or expansion of 25 reserves by 2027.King Charles walked a two-kilometre stretch of the new King Charles III England Coast Path | GETTY The Seven Sisters holds distinction as one of Britain’s most cherished protected environments, encompassing 1,500 hectares of vital wildlife habitat.Following the reception, the King will embark on a two-kilometre walk along the King Charles III England Coast Path, accompanied by Tony Juniper, Natural England’s Chair.This remarkable trail holds the distinction of being the world’s longest continuous managed coastal walking route.During the walk, His Majesty will encounter partners whose dedication brought the Seven Sisters reserve to life, before unveiling a plaque officially opening the site.The route concludes against the dramatic backdrop of the coastline, where the King will meet community leaders, charity representatives, and park rangers responsible for maintaining the path.A second plaque ceremony will formally inaugurate the Coast Path itself.The reserve stands apart as Britain’s first groundwater-inspired protected area, safeguarding essential drinking water supplies for the nearby coastal towns of Eastbourne and Seaford.King Charles met with Neil Constable, who managed the project, along with staff who helped bring the path to life | GETTY Its distinctive chalky terrain creates a natural aquifer system of considerable importance to the region.Beyond serving human needs, this chalk geology generates freshwater flows into the surrounding marine environment.These underwater springs support remarkable biodiversity, including the rare short-snouted seahorse.The 1,500-hectare site fulfils a dual purpose, securing both public water resources and precious ecological habitats that might otherwise face degradation.The conservation achievements reflect the broader ambitions of the King’s Series initiative.The King Charles III England Coast Path stretches an impressive 2,700 miles, weaving together iconic landmarks and previously inaccessible stretches of shoreline.Construction has required building over 1,000 miles of entirely new pathways, alongside substantial upgrades to established routes including the South West Coast Path.Workers have installed bridges and boardwalks, removed obstructive stiles, and resurfaced deteriorated sections throughout the project.King Charles enjoyed a reception at the Salt Marsh Café ahead of the walk | GETTY Approximately four-fifths of the trail currently welcomes visitors, with remaining sections expected to open during the summer months.Completion is anticipated next spring, when it will officially claim its title as the world’s longest managed coastal walking trail.Engineers have incorporated an innovative roll-back mechanism, enabling the path to retreat inland as erosion reshapes vulnerable cliffs.