St Brides Bay ( cy, Bae Sain Ffraid) is a

bay A bay is a recessed, coastal body of water that directly connects to a larger main body of water, such as an ocean, a lake, or another bay. A large bay is usually called a gulf, sea, sound, or bight. A cove is a small, circular bay with a na ...

in western

Pembrokeshire Pembrokeshire ( ; cy, Sir Benfro ) is a county in the south-west of Wales. It is bordered by Carmarthenshire to the east, Ceredigion to the northeast, and the rest by sea. The county is home to Pembrokeshire Coast National Park. The Park oc ...

West Wales West Wales ( cy, Gorllewin Cymru) is not clearly defined as a particular region of Wales. Some definitions of West Wales include only Pembrokeshire, Ceredigion and Carmarthenshire, which historically comprised the Welsh principality of '' Dehe ...

. Either

Skomer Island Skomer () or Skomer Island is an island off the coast of Pembrokeshire, in the community of Marloes and St Brides in west Wales. It is well known for its wildlife: around half the world's population of Manx shearwaters nest on the island, the ...

or the mainland extremity of Wooltack Point at the western end of the

Marloes Marloes is a village and parish in Pembrokeshire, Wales, on the Marloes Peninsula west of Milford Haven and forms the western tip of the southern shore of St Brides Bay. It is within part of the Pembrokeshire Coast National Park. The parish h ...

Peninsula marks the southern limit of the bay whilst its northern limit is marked by

Ramsey Island Ramsey Island (Welsh: ''Ynys Dewi'') is an island about off St David's Head in Pembrokeshire on the northern side of St Brides Bay, in southwest Wales, in the community of St Davids and the Cathedral Close. It is in area. Ramsey means (in Old ...

off

St David's Head St David's Head ( cy, Penmaen Dewi) is a headland in the Pembrokeshire Coast National Park, southwest Wales, which marks the divide between the Irish Sea and the Celtic Sea. It is noted for its wildflowers and wildlife, and for the remains of a ...

. The mouth of the bay is about wide and extends some eastwards from this line.

Geology

The northern and southern shores of the bay are mainly rocky in nature, backed by cliffs up to high. Its eastern shore comprises a series of large and small sandy beaches between rocky sections. The geological exposures around the bay reveal great complexity with considerable folding and faulting of the

strata In geology and related fields, a stratum ( : strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as e ...

. The cliffs of its southern shore are formed from

sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicat ...

s of

Ordovician The Ordovician ( ) is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.6 million years from the end of the Cambrian Period million years ago (Mya) to the start of the Silurian Period Mya. T ...

and

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, wh ...

age together with a suite of both intrusive and extrusive

igneous Igneous rock (derived from the Latin word ''ignis'' meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or ...

rocks, some of which are

Precambrian The Precambrian (or Pre-Cambrian, sometimes abbreviated pꞒ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon. The Precambrian is so named because it preceded the Cambrian, the first period of th ...

in age. Those in the north comprise a series of Precambrian and

Cambrian The Cambrian Period ( ; sometimes symbolized Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million years ago ...

age rocks of both

sedimentary Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...

and igneous origin. In contrast, the eastern shore is formed from the more readily eroded rocks of

Carboniferous The Carboniferous ( ) is a geologic period and system of the Paleozoic that spans 60 million years from the end of the Devonian Period million years ago ( Mya), to the beginning of the Permian Period, million years ago. The name ''Carboniferou ...

age. These are largely the sandstones and

mudstone Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from '' shale'' by its lack of fissility (parallel layering).Blatt, H., and R.J. Tracy, 1996, ''Petrology.' ...

s of the

Coal Measures In lithostratigraphy, the coal measures are the coal-bearing part of the Upper Carboniferous System. In the United Kingdom, the Coal Measures Group consists of the Upper Coal Measures Formation, the Middle Coal Measures Formation and the Lower Coa ...

but include a small section of shales and sandstones assigned to the Millstone Grit Series. Contorted coal seams within the Coal Measures were once worked though the Pembrokeshire Coalfield was never of major economic importance.

Designations

The coast surrounding it forms a part of the

Pembrokeshire Coast National Park Pembrokeshire Coast National Park ( cy, Parc Cenedlaethol Arfordir Penfro) is a national park along the Pembrokeshire coast in west Wales. It was established as a National Park in 1952. It is one of three national parks in Wales, the others ...

which was designated in 1951 in recognition of the outstanding quality of its landscape. Much of the coastline is also defined as heritage coast. The whole of St Bride's Bay along with adjoining areas of sea around the Pembrokeshire Coast is protected under European environmental law as a

special area of conservation A Special Area of Conservation (SAC) is defined in the European Union's Habitats Directive (92/43/EEC), also known as the ''Directive on the Conservation of Natural Habitats and of Wild Fauna and Flora''. They are to protect the 220 habitats and a ...

(or 'SAC'). Parts of the coast are additionally defined as

special protection area A Special Protection Area (SPA) is a designation under the European Union Directive on the Conservation of Wild Birds. Under the Directive, Member States of the European Union (EU) have a duty to safeguard the habitats of migratory birds and certa ...

s (or 'SPAs'). There are also three or four

sites of special scientific interest A Site of Special Scientific Interest (SSSI) in Great Britain or an Area of Special Scientific Interest (ASSI) in the Isle of Man and Northern Ireland is a conservation designation denoting a protected area in the United Kingdom and Isle of ...

(or 'SSSIs') around its perimeter.Countryside Council for Wales 2008, ''Internationally protected areas in Wales'' (poster)

Villages and amenities

The bay's coast is dotted with small

village A village is a clustered human settlement or community, larger than a hamlet but smaller than a town (although the word is often used to describe both hamlets and smaller towns), with a population typically ranging from a few hundred ...

s including

St Brides St Brides ( cy, Sain Ffraid) is a parish and small coastal village in Pembrokeshire, Wales, at the south of St Brides Bay, about north of the larger village of Marloes, with which it forms the Marloes and St Brides community. The village is ...

, Martin's Haven,

Little Haven Little Haven ( cy, Hafan Fach) is a village at the south-east corner of St Bride's Bay, Pembrokeshire, Wales. It is in the Pembrokeshire Coast National Park. Together with Broad Haven to the north, Little Haven forms The Havens community for ...

, Broad Haven, Nolton Haven, Newgale and

Solva Solva ( cy, Solfach) is a village, community and electoral ward in Pembrokeshire, Wales. The village comprises principally Lower Solva and Upper Solva. The community also includes Middle Mill and Whitchurch. Location Solva lies on the north ...

, whilst Britain's smallest city, St David's lies nearby. The

Pembrokeshire Coast Path The Pembrokeshire Coast Path ( cy, Llwybr Arfordir Sir Benfro), often called the Pembrokeshire Coastal Path, is a designated National Trail in Pembrokeshire, southwest Wales. Established in 1970, it is a long-distance walking route, mostly a ...

follows its entire coastline. It is well known among residents and tourists for

fishing Fishing is the activity of trying to catch fish. Fish are often caught as wildlife from the natural environment, but may also be caught from fish stocking, stocked bodies of water such as fish pond, ponds, canals, park wetlands and reservoirs. ...

. Image:St Davids from Cloisters Pembrokeshire.JPG, New cloisters, St. David's Image:Solva Colours.JPG, Colourful cottages in Solva Image:Clock Tower Marloes Pem.JPG, Clock tower, Marloes Image:Fishing Sunset Little Haven Sunset.JPG, Fishing at sunset, Little Haven Image:St Bride's Inn Little Haven Pem.JPG, St. Bride's Inn, Little Haven Image:Seal St Davids Pembrokeshire.JPG, Seal at St. David's, Pembrokeshire

References

External links

Photographs of St Brides Bay and surrounding area on Geograph
{{Coord, 51.81, -5.23, type:waterbody_region:GB_dim:50000, display=title Bays of Pembrokeshire