The Pembrokeshire Coast National Park

.... is the only national park in the United Kingdom to consist largely of coastal landscapes. The National Park has a varied landscape of rugged cliffs, sandy beaches, wooded estuaries, wild inland hills, the moorland of the Preseli Hills and the wooded Gwaun valley. The total area is 629 km2 (243 sq mi). There are four distinct sections: clockwise these are the south Pembrokeshire coast, including Caldey Island; the Daugleddau estuary; the St Bride's Bay coast, including the coastal islands; and the Preseli Hills.

The geology of the area is of particular interest with many good exposures both inland and along the coast, exhibiting a variety of rock types and structural features such as natural arches, stacks, rock folding and sea caves. A stack of note is Elegug Stacks (Creigiau Elegug), two large detached pillars of limestone which in the spring provide valued nesting sites for razorbills and guillemots. In the north, the rocks of Carn Llidi, Pen Beri and Garn Fawr, together with the extensive moorland on Mynydd Carningli and Mynydd Preseli, give an exposed and mountainous feel to the landscape, cut through by the wooded valleys of the Gwaun and Nevern.

In the west, the National Park is dominated by the broad sweep of St Bride's Bay, bounded at its northern end by Ramsey Island, near St David's peninsula, and at its southern end by Skomer. The southern coast is another contrast, with the limestone plateau and cliffs of the Castlemartin peninsula, the steep-sided wooded valleys inland from Amroth; the Bosherston lakes — now, like much of the coastal strip, in the care of the National Trust — and the tourist resorts of Tenby and Saundersfoot. Between the western and southern areas of the National Park lies the Milford Haven waterway, where the tranquil Daugleddau estuary feeds into one of the finest natural deep water harbours in the world.

The National Park includes many sites (such as Pentre Ifan) of historic and archaeological importance and areas which are of national or international nature conservation significance in their own right, including 7 Special Areas of Conservation, a Marine Nature Reserve, 6 national nature reserves and 75 Sites of Special Scientific Interest.

In 2011, National Geographic Traveler magazine voted Pembrokeshire the second best coastal destination in the world for sustainable tourism.