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The Bristol Channel (Welsh: Môr Hafren, meaning 'Severn Sea') is a major inlet in the island of Great Britain, separating South Wales from Devon and Somerset in South West England. It extends from the lower estuary of the River Severn (Welsh: Afon Hafren) to the North Atlantic Ocean. It takes its name from the English city of Bristol, and is over 30 miles (50 km) across at its widest point.
Long stretches of the coastline of the Bristol Channel, on both the South Wales and West Country sides, are designated as Heritage Coast, including Exmoor, Bideford Bay, the Hartland Point peninsula, Lundy Island, Glamorgan, Gower Peninsula, South Pembrokeshire and Caldey Island.
The upper limit of the Channel is between Sand Point, Somerset and Lavernock Point in South Wales. East of this line is the Severn Estuary. Western and northern Pembrokeshire, and north Cornwall are outside the defined limits of the Bristol Channel, and are considered part of the seaboard of the Atlantic Ocean, more specifically the Celtic Sea.
The Bristol Channel is an important area for wildlife, in particular waders, and has protected areas, including National Nature Reserves such as Bridgwater Bay at the mouth of the River Parrett. At low tide large parts of the channel become mud flats due to the tidal range of 13 metres (43 ft), second only to Bay of Fundy in Eastern Canada. Development schemes have been proposed along the channel, including an airport and a tidal barrier for electricity generation, but conservation issues have so far managed to block such schemes.
The largest islands in the Bristol Channel are Lundy, Steep Holm and Flat Holm. The islands and headlands provide some shelter for the upper reaches of the channel from storms. These islands are mostly uninhabited and protected as nature reserves, and are home to some unique wild flower species. In 1971 a proposal was made by the Lundy Field Society to establish a marine reserve. Provision for the establishment of statutory Marine Nature Reserves was included in the Wildlife and Countryside Act 1981, and on 21 November 1986 the Secretary of State for the Environment announced the designation of a statutory reserve at Lundy. There is an outstanding variety of marine habitats and wildlife, and a large number of rare and unusual species in the waters around Lundy, including some species of seaweed, branching sponges, sea fans and cup corals.
The Bristol Channel has some extensive and popular beaches and spectacular scenery, particularly on the coasts of Exmoor and Bideford Bay in North Devon and the Vale of Glamorgan and Gower Peninsula on the Glamorgan coast. The western stretch of Exmoor boasts Hangman cliffs, the highest cliffs in mainland Britain, culminating near Combe Martin in the "Great Hangman", a 1,043 ft (318 m) 'hog-backed' hill with a cliff-face of 820 ft (250 m); its sister cliff "The Little Hangman" has a cliff-face of 716 ft (218 m). On the Gower Peninsula, at its western extremity is the Worms Head, a headland of carboniferous limestone which is approachable on foot at low tide only. The beaches of Gower (at Rhossili, for example) and North Devon, such as Croyde and Woolacombe, win awards for their water quality and setting, as well as being renowned for surfing. In 2004, The Times "Travel" magazine selected Barafundle Bay in Pembrokeshire as one of the twelve best beaches in the world. In 2007, Oxwich Bay made the same magazine's Top 12 best beaches in the world list, and was also selected as Britain's best beach for 2007.
The city of Swansea is the largest settlement on the Welsh coast of the Bristol Channel. Other major built-up areas include Barry (including Barry Island), Port Talbot and Llanelli. Smaller resort towns include Porthcawl, Mumbles, Saundersfoot and Tenby.
There are no cities on the English coast but the resorts of Burnham-on-Sea, Watchet, Minehead and Ilfracombe face directly onto the Bristol Channel, whereas Barnstaple and Bideford are sited on estuaries opening onto Bideford Bay at the westernmost end of the Bristol Channel. The city of Bristol, originally established on the River Avon but now with docks on the Severn estuary, is one of the most important ports in Britain and gives its name to the Channel which forms its seaward approach.
There are no road or rail crossings of the Bristol Channel so direct crossings are necessarily made by sea or air, or less directly by the road and rail crossings of the Severn estuary. The Channel can be a hazardous area of water because of its strong tides and the rarity of havens on the north Devon and Somerset coasts that can be entered in all states of the tide. Because of the treacherous waters, pilotage is an essential service for shipping. A specialised style of sailing boat, the Bristol Channel Pilot Cutter, developed in the area.
P and A Campbell of Bristol were the main operators of pleasure craft, particularly paddle steamers, from the mid-19th century to the late 1970s, together with the Barry Railway Company. These served harbours along both coasts, such as Ilfracombe and Weston-super-Mare.
This tradition is continued each summer by the PS Waverley, the last seagoing paddle steamer in the world, built in 1947. The steamer provides pleasure trips between the Welsh and English coasts and to the islands of the channel. Trips are also offered on the MV Balmoral, also owned by Waverley Excursions.
The Burnham-on-Sea Area Rescue Boat (BARB) uses a hovercraft to rescue people from the treacherous mud flats on that part of the coast. A hovercraft was recently tested to determine the feasibility of setting up a similar rescue service in Weston-super-Mare. There are also RNLI lifeboats stationed along both sides of the Channel. In the Severn Estuary, in-shore rescue is provided by two independent lifeboat trusts, the Severn Area Rescue Association (SARA) and the Portishead and Bristol Lifeboat Trust.
The Bristol Channel and Severn Estuary have the potential to generate more renewable electricity than all other UK estuaries. It has been stated that, if harnessed, it could create up to 5% of the UK’s electricity, contributing significantly to UK climate change goals and European Union renewable energy targets. The Severn Tidal Power Feasibility Study was launched in 2008 by the UK Government to assess all tidal range technologies, including barrages, lagoons and others. The study will look at the costs, benefits and impacts of a Severn tidal power scheme and will help Government decide whether it could or could not support such a scheme. Some of the options being looked at may include a road crossing downstream of the existing crossings of the estuary.
On 30 January 1607 (New style) thousands of people were drowned, houses and villages swept away, farmland inundated and flocks destroyed when a flood hit the shores of the Channel. The devastation was particularly bad on the Welsh side, from Laugharne in Carmarthenshire to above Chepstow on the English border. Cardiff was the most badly affected town. There remain plaques up to 8 ft (2.4 m) above sea level to show how high the waters rose on the sides of the surviving churches. It was commemorated in a contemporary pamphlet "God's warning to the people of England by the great overflowing of the waters or floods."
The cause of the flood is uncertain and disputed. It had long been believed that the floods were caused by a combination of meteorological extremes and tidal peaks, but research published in 2002 showed some evidence of a tsunami in the Channel. Although some evidence from the time describes events similar to a tsunami, there are also similarities to descriptions of the 1953 floods in East Anglia, which were caused by a storm surge. It has been shown that the tide and weather at the time were capable of generating such a surge.
In 1835 John Ashley was on the shore at Clevedon with his son who asked him how the people on Flat Holm could go to church. For the next three months Ashley voluntarily ministered to the population of the island. From there he recognised the needs of the seafarers on the four hundred sailing vessels in the Bristol Channel and created the Bristol Channel Mission. He raised funds and in 1839 a specially designed mission cutter was built with a main cabin which could be converted into a chapel for 100 people, this later became first initiative of the Mission to Seafarers.
Much of the coastline at the western end of the Bristol Channel faces west towards the Atlantic Ocean meaning that a combination of an off-shore (east) wind and a generous Atlantic swell produces excellent surf along the beaches. The heritage coasts of the Vale of Glamorgan, Bideford Bay and Gower are, along with the Atlantic coasts of Pembrokeshire and Cornwall, the key areas for surfing in the whole of Britain. Although slightly overshadowed by the Atlantic coasts of North Cornwall and West Pembrokeshire, both Gower and Bideford Bay nevertheless have several superb breaks—notably Croyde in Bideford Bay and Langland Bay on Gower—and surfing in Gower and Bideford Bay is enhanced by the golden beaches, clean blue waters, excellent water quality and good facilities close by to the main surf breaks.
The high quality of the landscape of much of both coasts of the Bristol Channel means that they are popular destinations for walkers. Sections of two national trails; the South West Coast Path and the Pembrokeshire Coast Path follow these shores, and the West Somerset Coast Path extends eastwards from the South West Coast Path to the mouth of the River Parrett. A continuous coastal path, the Wales Coast Path, was opened in May 2012 along the entire Welsh shore under the auspices of the Countryside Council for Wales.
The first person to swim across the Bristol Channel was Kathleen Thomas, a 21 year old woman from Penarth who swam to Weston-super-Mare on 5 September 1927. She completed the swim, nominally 11 miles but equivalent to 22 miles because of tidal flows, in 7 hours 20 minutes. In 2007 the achievement was marked by a plaque in seafront in Penarth.
In 1929 Edith Parnell, a 16 year old schoolgirl, emulated Katherine Thomas's swim from Penarth to Weston-super-Mare in 10 hours 15 minutes. Edith later became the first wife of Hugh Cudlipp the Welsh journalist and newspaper editor.
The 30.5 nautical miles (56.5 km; 35.1 mi) from Ilfracombe to Swansea leg has been added as the first of three challenges in the Three Channels Challenge. Darren Jaundrill completed this swim in May 2011 with a time of 21 hours and 46 minutes.   
The youngest person to swim the Bristol Channel from Penarth to Clevedon is Gary Carpenter who at age 17 on August Bank Holiday 2007, swam the channel in 5 hours 35 minutes making him the youngest and fastest swimmer of the Bristol Channel. Gary Carpenter's coach Steve Price was the first ever person to swim from Penarth to Clevedon back in 1990.