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:Ireland is an island in northwest Europe in the north Atlantic Ocean. The island lies on the European continental shelf, part of the Eurasian Plate. The island's main geographical features include low central plains surrounded by a ring of coastal mountains. The highest peak is Carrauntoohil ((アイルランド語:Corrán Tuathail)), which is above sea level. The western coastline is rugged, with many islands, peninsulas, headlands and bays. The island is bisected by the River Shannon, which at with a estuary is the longest river in Ireland and flows south from County Cavan in Ulster to meet the Atlantic just south of Limerick. There are a number of sizeable lakes along Ireland's rivers, of which Lough Neagh is the largest. Politically, the island consists of the Republic of Ireland, with jurisdiction over about five-sixths of the island; and Northern Ireland, a constituent country (and an unconfirmed "practical" exclave) of the United Kingdom, with jurisdiction over the remaining sixth. Located west of the island of Great Britain, it is located at approximately . It has a total area of . It is separated from Great Britain by the Irish Sea and from mainland Europe by the Celtic Sea. Ireland and Great Britain, together with nearby islands, are known collectively as the British Isles; as the term British Isles is controversial in relation to Ireland, the alternative term Britain and Ireland is increasingly preferred. ==Geological development== (詳細はrock is about 1.7 billion years old and is found on Inishtrahull Island off the north coast of County Donegal and also at Annagh Head on the Mullet Peninsula. In other parts of Donegal, scientists have discovered rocks that began life as glacial deposits, demonstrating that at this early period, part of what was to become Ireland was in the grip of an ice age. However, because of the effects of later upheavals, it is almost impossible to sequence these early rock layers correctly. About 600 million years ago, at the end of the Precambrian super-eon, the Irish landmass was divided in two, with one half on the western side of the Iapetus Ocean in Laurentia and the other on the eastern side in the micro-continent Avalonia, both at a latitude of around 80° South, close to what is now northwest Africa. From the evidence of fossils found at Bray Head in County Wicklow, Ireland was below sea level at this time. Over the next 50 million years, these two parts drifted towards each other, eventually uniting about 440 million years ago. Fossils discovered near Clogherhead, County Louth, show the coming together of shoreline fauna from both sides of the original dividing ocean. The mountains of northwest Ireland were formed during the collision, as was the granite that is found in locations in Donegal and Wicklow. The Irish landmass was now above sea level and lying near the equator, and fossil traces of land-based life forms survive from this period. These include fossilised trees from Kiltorcan, County Kilkenny, widespread bony fish and freshwater mussel fossils and the footprints of a four-footed amphibian preserved in slate on Valentia Island, County Kerry. Old Red Sandstone also formed at this time. Between 400 million and 300 million years ago, Northwest Europe – including Ireland – sank beneath a warm, calcium-rich sea. Great coral reefs formed in these waters, eventually creating the limestone that still makes up about 65 per cent of the rock mantle of the island. As the waters receded, tropical forests and swamps flourished. The resulting vegetable debris eventually formed coal, most of which was later eroded. This period, known as the Carboniferous period, ended with further tectonic movement which saw Ireland drift further northward. The resulting pressure created those Irish mountain and hill ranges that run in a northeast to southwest direction. By 250 million years ago, Ireland was at the latitude of present-day Egypt and had a desert climate. It was at this time that most of the coal and sandstone were eroded. The thinner layers of limestone in the south of the country were also partially affected by this erosion. The limestone that was exposed by the disappearance of its sandstone mantle was affected by carbon dioxide and other factors resulting in a karstic landscape that can still be seen in the Burren in County Clare. Shortly after this period, organic debris in the seas around Ireland began to form the natural gas and petroleum deposits that now play a role in the economy of Ireland. Then, about 150 million years ago, Ireland was again submerged, this time in a chalky sea that resulted in the formation of chalk over large parts of the surface. Traces of this survive under the basalt lava that is found in parts of the north. About 66 million years ago, the volcanic activity that formed this lava began. The Mourne Mountains and other mountains in the northern part of the island formed as a result of this activity. Climatic conditions at this time were warm and vegetation thrived. Vegetable debris in the Antrim Depression formed deposits of brown coal or lignite which remain untouched down to the present time. The warm conditions produced high rainfall that accelerated processes of erosion and the formation of karstic landscape forms. By 25 million years ago, Ireland was close to assuming its present position. The long period of erosion had resulted in considerable soil formation and most of the rock mantle was covered. In areas with good drainage, the covering consisted of brown or grey soil, while in poorly drained areas, black clay tended to dominate. As the climate cooled, soil formation slowed down, and a flora and fauna that would millions of years later be familiar to the first human inhabitants, began to emerge. By about three million years ago, the present landscape of Ireland had more or less formed. Since about 1.7 million years ago, the earth has been in the grip of a cycle of warm and cold stages and these have, inevitably, affected Ireland. The earliest evidence we have for this effect comes from the period known as the Ballylinian Warm Stage, some half a million years ago. At this time, most of what are now considered to be native Irish trees were already established on the island. The action of the ice during the cold stages was the major factor in bringing the Irish landscape to its current form. Obvious impacts of the ice on the landscape include the formation of glacial valleys such as Glendalough in Wicklow and of corries, or glacial lakes. The depositing of mounds of debris under the melting ice created drumlins, a common feature of the landscape across the north midlands. Streams also formed under the ice and the material deposited by these formed eskers (Irish ''eiscir''). The greatest of these, the Esker Riada, divides the northern and southern halves of the island and its ridge once served as the main highway connecting the east and west coasts. About one half of the coastline consists of a low-lying dune pasture land known as ''Machair''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Geography of Ireland」の詳細全文を読む スポンサード リンク
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