Ағылшын жерінің аңызға айналған суға батқан жері Лионесс

Mythical sunken land, part of England

Lyonesse (/liːɒˈnɛs/ lee uh NESS) is a kingdom which, according to legend, consisted of a long strand of land stretching from Land's End at the southwestern tip of Cornwall, England, to what is now the Isles of Scilly in the Celtic Sea portion of the Atlantic Ocean. It was considered lost after being swallowed by the ocean in a single night. The people of Lyonesse were said to live in fair towns, with over 140 churches, and work in fertile, low lying plains. Lyonesse's most significant attraction was a castle like cathedral that was presumably built on top of what is now the Seven Stones Reef between Land's End and the Isles of Scilly, some 18 mile (29 km) west of Land's End and 8 mile (13 km) north east of the Isles of Scilly. Lyonesse is mentioned in Arthurian legend, specifically in the tragic love and loss story of Tristan and Iseult. It was the home of the hero Tristan (one of the Knights of the Round Table), whose father Meliodas was king of Lyonesse. After the death of Meliodas, Tristan became the heir of Lyonesse, but he was never to take up his inheritance because the land sank beneath the sea while he was away at his uncle King Mark's court in Cornwall. In later traditions, Lyonesse is said to have sunk beneath the waves in a single night, but stories differ as to whether this catastrophic event occurred on 11 November 1099, or 10 years earlier. According to one legend, the people of Lyonesse had committed a crime so terrible that God took his revenge against them and their kingdom. The exact nature of the crime is never specified, but the legend tells of a horrific storm that occurred over the course of a single night, resulting in an enormous wave that swallowed the kingdom.

Local Cornwall village tourism guides offer stories of a man who escaped the storm and a subsequent wave while riding a white horse. Apparently, the horse lost one of its shoes during the escape. The rider's name is thought to be Trevelyan (or Trevilian). The rider had been out hunting during the day and had fallen asleep under a tree. Trevelyan was awoken by a horrible noise and raced across the land to higher ground. This story is linked to local Cornish families who have used the image of three horseshoes as part of their family crest for generations. One family in particular goes by the name Vyvyan, and is one of Cornwall's oldest families; they also have a crest of a white horse and claim to be descendants of the sole survivor, Trevelyan. The Vyvyan family claims that Trevelyan was the last governor of the lost kingdom before Lyonesse was swallowed by the ocean. Today, many myths and legends continue to arise about Lyonesse without physical evidence. Included among these legends are tales of local fishermen who claim that on calm days, one can still hear the bells of the many churches softly ringing in the seas off the west Cornish coast. Local fishermen also claim that they have caught glass, forks, and wood in their fishing nets.

A 2009–13 joint study titled The Lyonesse Project: A Study of the Coastal and Marine Environment of the Isles of Scilly was commissioned by English Heritage and carried out by the Historic Environment Projects, Cornwall Council, with a team of academics, local experts, and enthusiasts "to reconstruct the evolution of the physical environment of the Isles of Scilly during the Holocene, the progressive occupation of this changing coastal landscape by early peoples, and their response to marine inundation and changing marine resource availability." The project found that while much of the story of Lyonesse can be "dismissed as fantasy", an overflow of legends and memories of submergences is common throughout the northwestern portion of Europe. It concluded that the Isles of Scilly were once a single large island, which separated into smaller islands due to the rapid sea level rise. Stone walls have been located under the water in the vicinity of the Isles of Scilly, which support the findings that sea level rises impacted the towns of the area, although whether they are evidence of buildings or the remains of medieval fish traps remains unclear.

The legend of a sunken kingdom appears in Cornish, Breton and Welsh mythologies. In Christian times, it came to be viewed as a sort of Cornish Sodom and Gomorrah, an example of divine wrath provoked by unvirtuous living. A Breton parallel is found in the tale of the Cité d'Ys or Ker Ys, similarly drowned as a result of its debauchery, with a single virtuous survivor, King Gradlon, escaping on a horse. According to Welsh legend, the kingdom of Cantre'r Gwaelod in Cardigan Bay was drowned due to the drunkard negligence of its prince, Seithenyn, who allowed the sea to sweep through the floodgates. The tale of Lyonesse is sometimes suggested to represent an extraordinary survival of folk memory of the flooding of the Isles of Scilly and Mount's Bay near Penzance when the sea levels rose during the Bronze Age. For example, the Cornish name of St Michael's Mount is Karrek Loos y'n Koos – literally "the grey rock in the wood", suggesting that the bay was once a forest. According to local tourism guides in the region, Lyonesse was once connected to the west of Cornwall and is firmly rooted in Cornwall's traditions and mythology. Cornish people around Penzance still get occasional glimpses at extreme low water of a sunken forest in Mount's Bay, where petrified tree stumps become visible adjacent to the Celtic Sea. John of Worcester, a famous English monk and chronicler, wrote in 1099 that St Michael's Mount (now an island in Mount's Bay) was five or six miles from the sea, enclosed in a thick wood. The importance of the maintenance of this memory can be seen in that it came to be associated with the legendary Brython hero Arthur, although the date of its inundation is actually c. 2500 BC.

Dawn in Lyonesse is a 1938 short novel by Mary Ellen Chase. The Lyonesse Trilogy is a group of three novels by Jack Vance. Lyonesse: The Well Between the Worlds (2009) and Lyonesse: Dark Solstice (2010) are two children's books by Sam Llewellyn. The manga and anime series The Seven Deadly Sins is set in the kingdom of Liones, which is placed in the north of Britannia (i. e., Lothian instead of Cornwall) on in universe maps. In the 1995 film First Knight, before her marriage to King Arthur, Guinevere rules as "Lady of Lyonesse".

SS Lyonesse is a steam ferry of the West Cornwall Steam Ship Company. Lyonesse: Great Western Railway Bulldog class steam locomotive no. 3361
Lyonnesse: Southern Railway King Arthur class steam locomotive no. 743
Lyonnesse: British Railways standard class 5 steam locomotive no. 73113.