The park divides naturally into four distinct sections. The southern Pembrokeshire coast, including Caldey Island, presents a limestone plateau whose cliffs plunge into the Celtic Sea. The Daugleddau estuary, where the tranquil tidal waters of the Eastern and Western Cleddau rivers meet, feeds into the Milford Haven waterway -- one of the finest natural deep-water harbors in the world. The western section is dominated by the broad sweep of St Bride's Bay, bounded at its northern end by Ramsey Island near the St David's peninsula and at its southern end by Skomer, an island famous for its puffin colonies. To the north, the Preseli Hills and the moorland of Mynydd Carningli give the landscape an exposed, mountainous character, cut through by the wooded valleys of the River Nevern. Each section feels like a different country.

The geology of the Pembrokeshire coast reads like a compressed manual of Earth history. Natural arches, sea stacks, rock folds, and sea caves punctuate the shoreline, each one a lesson in how water, wind, and time reshape resistant stone. The Elegug Stacks -- two large detached pillars of limestone off the Castlemartin peninsula -- are among the most photographed features, providing nesting sites for razorbills and guillemots each spring. The rocks of Carn Llidi, Pen Beri, and Garn Fawr in the north belong to an entirely different geological era, ancient igneous intrusions that give the headlands a dark, dramatic profile against the Atlantic sky. Inland, the Preseli Hills hold a secret connection to a monument 150 miles east: the bluestones of Stonehenge were quarried here, probably around 3000 BC, and transported across Wales and England by means that archaeologists still debate. The park also contains Pentre Ifan, one of the finest Neolithic dolmens in Britain, its massive capstone balanced impossibly on three uprights.

The Pembrokeshire Coast Path, designated as a National Trail in 1970, runs for 186 miles at cliff-top level from Amroth in the south to St Dogmaels in the north, with a total of 35,000 feet of ascent and descent -- roughly equivalent to climbing Everest from sea level. Since 2012, the path has connected to the Wales Coast Path, the 870-mile route that follows the entire Welsh coastline from Chepstow to Queensferry. Walking the Pembrokeshire section is an exercise in constant visual drama: one moment you are high on a clifftop watching gannets dive, the next you are descending into a sheltered cove where the water is Caribbean-clear. The path passes through a landscape that contains 7 Special Areas of Conservation, a Marine Nature Reserve, 6 national nature reserves, and 75 Sites of Special Scientific Interest. Pembrokeshire's beaches -- Barafundle Bay, Whitesands, Freshwater West, Broad Haven -- have collectively earned hundreds of Blue Flag, Green Coast, and Seaside Awards.

Pembrokeshire's coastline is not static. In January 2016, the National Park Authority launched the 'Changing Coasts' project to document how recent winter storms have reshaped the shoreline, inviting visitors to submit photographs from fixed points to build a visual record of erosion and change. The pilot study began at Abereiddy, where a former slate quarry now forms the famous Blue Lagoon. The project is a tacit acknowledgment that the coastline the park was created to protect in 1952 is not the same coastline that exists today, and will not be the same coastline that exists tomorrow. Storm surges, rising sea levels, and shifting sediment patterns are redrawing the map in real time. The park authority, with around 150 staff and 18 committee members based in Pembroke Dock, manages this evolving landscape while balancing conservation with the economic needs of the communities within its boundaries. It is a mandate that grows more complex with each passing winter.