The newest section of the trail that starts by the sand dunes at West Wittering will provide residents and visitors of West Sussex with health and wellbeing opportunities.
Works will continue to connect the country's entire coastline into one long National Trail that will take people through some of England's finest landscapes, coastal towns, cities and ports.
Jim Seymour, Natural England area manager for Kent and Sussex said: "This new trail has spectacular sweeping coastal views, beautiful spots like Pagham harbour, and abundant wildlife at Medmerry while providing sustainable sea defences.
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"At a time when the benefits of connecting with nature are clearer than ever, it’s fabulous that we are opening up this 44-mile walking route on the West Sussex coast for people to enjoy."
Deborah Urquhart, West Sussex County Council cabinet member for environment and climate change, said: "We're delighted to see this stretch of the King Charles III England Coast Path open, giving residents and visitors alike new opportunities to explore our beautiful coastline.
"The works have provided new boardwalks, improvements to path surfaces, and better signage, providing a much-needed boost for local businesses and making it easier than ever to visit our varied landscapes.
"The new trail will not only be beneficial to the health and well-being of all who use it but will also protect our coastal paths for future generations to enjoy.
"From seaside promenade, sweeping beaches, historic towns, and internationally important nature reserves, there really is plenty for everyone to enjoy."
