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81-607: Lough Tay (Irish: Loch Té ), is a small but scenic lake set on private property in the Wicklow Mountains in Ireland . The lake lies between the mountains of Djouce 725 metres (2,379 ft), and Luggala 595 metres (1,952 ft), and is dominated by Luggala's east-facing granite cliffs. The lough is fed by the Cloghoge River, which then drains into Lough Dan to the south. The entire of Lough Tay belongs to

162-550: A Special Protection Area under European Union law. The Wicklow Mountains National Park was established in 1991 to conserve the local biodiversity and landscape. The Wicklow Mountains take their name from County Wicklow which in turn takes its name from Wicklow town . The origin of the name is from the Old Norse Wykynglo or Wykinlo . The Irish name for Wicklow, Cill Mhantáin , means "Church of Mantan", named after an apostle of Saint Patrick . Wicklow

243-429: A discontinuity that may have a large influence on the mechanical behavior (strength, deformation, etc.) of rock masses in, for example, tunnel , foundation , or slope construction. A hazard may exist even in undisturbed terrain. On August 17, 1959, a magnitude 7.2 earthquake destabilized a mountain slope near Hebgen Lake , Montana, composed of schist. This caused a massive landslide that killed 26 people camping in

324-414: A mountain biking course. Schist Schist typically forms during regional metamorphism accompanying the process of mountain building ( orogeny ) and usually reflects a medium grade of metamorphism. Schist can form from many different kinds of rocks, including sedimentary rocks such as mudstones and igneous rocks such as tuffs . Schist metamorphosed from mudstone is particularly common and

405-553: A schistose metasandstone (if the protolith is known to have been a sandstone ). If all that is known is that the protolith was a sedimentary rock, the schist will be described as a paraschist , while if the protolith was an igneous rock, the schist will be described as an orthoschist . Mineral qualifiers are important when naming a schist. For example, a quartz-feldspar-biotite schist is a schist of uncertain protolith that contains biotite mica, feldspar , and quartz in order of apparent decreasing abundance. Lineated schist has

486-711: A glacier at the contact point between the granite and mica-schist of the Wicklow Mountains. The waterfalls at the heads of the valleys of Glendalough, Glenmacnass and Glendasan also occur approximately at the schist-granite junctions, as does the Carrawaystick waterfall in Glenmalure . The River Slaney rises in the North Prison of Lugnaquilla mountain and winds through the Glen of Imaal where it

567-425: A high route through the Wicklow Mountains, avoiding the defences along the normal route to the west of the mountains. The Norman invasion displaced two important Gaelic clans from Kildare , the O'Byrnes and the O'Tooles , who moved into the Wicklow Mountains, the O'Byrnes in the east and the O'Tooles in the west. From their mountain strongholds both families conducted a persistent campaign of harassment against

648-704: A military road through the mountains, similar to those built in the Scottish Highlands to quell the Jacobite risings , was proposed by the British government to enable troops to be deployed quickly into the region. The Wicklow Military Road was constructed between 1800 and 1809 and runs from Rathfarnham , County Dublin to Aghavannagh , County Wicklow via Glencree , the Sally Gap and Laragh . A series of army barracks and police stations were built along

729-494: A preferred orientation. Schists make up one of the three divisions of metamorphic rock by texture , with the other two divisions being gneiss , which has poorly developed schistosity and thicker layering, and granofels , which has no discernible schistosity. Schists are defined by their texture without reference to their composition, and while most are a result of medium-grade metamorphism, they can vary greatly in mineral makeup. However, schistosity normally develops only when

810-412: A strong linear fabric in a rock which otherwise has well-developed schistosity. Schistosity is developed at elevated temperature when the rock is more strongly compressed in one direction than in other directions ( nonhydrostatic stress ). Nonhydrostatic stress is characteristic of regional metamorphism where mountain building is taking place (an orogenic belt ). The schistosity develops perpendicular to

891-668: A train service there was considered in 1897 but the proposals came to nothing. The tourism potential of the Military Road was spotted soon after its completion and G. N. Wright's Tours in Ireland (1822) is one of the earliest guides to the sights along the route. The principal farming activity in the uplands is sheep grazing , using mainly the Wicklow Cheviot breed. Land is also used for forestry and turf cutting . Tourism and recreation are also major activities in

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972-408: A very large class of metamorphic rock, geologists will formally describe a rock as a schist only when the original type of the rock prior to metamorphism (the protolith ) is unknown and its mineral content is not yet determined. Otherwise, the modifier schistose will be applied to a more precise type name, such as schistose semipelite (when the rock is known to contain moderate amounts of mica) or

1053-418: A year on the highest peaks. Strong winds are an important factor in peat erosion on the summits. The primary habitat of the uplands consists of heath and bog . The mountain blanket bogs formed around 4,000 years ago as a result of a combination of climate change and human activity. Prior to this, the mountains were cloaked with pine forest . A change in the climate to wetter and milder weather left

1134-406: Is a thin layering of the rock produced by metamorphism (a foliation ) that permits the rock to easily be split into flakes or slabs less than 5 to 10 millimeters (0.2 to 0.4 in) thick. The mineral grains in a schist are typically from 0.25 to 2 millimeters (0.01 to 0.08 in) in size and so are easily seen with a 10× hand lens . Typically, over half the mineral grains in a schist show

1215-697: Is an ornamental building known as the Temple. Next to it are three graves of members of the Guinness family. One of those buried there is Tara Browne , whose death in a car accident was an inspiration for the Beatles song " A Day in the Life "; the two others are his unnamed infant brother, who was born and died in December 1943, and his half-sister. Lough Tay is the setting for the fictional village of Kattegat in

1296-490: Is derived ultimately from the Greek word σχίζειν ( schízein ), meaning "to split", which refers to the ease with which schists can be split along the plane in which the platy minerals lie. Before the mid-19th century, the terms slate , shale and schist were not sharply differentiated by those involved with mining. Geologists define schist as medium-grained metamorphic rock that shows well-developed schistosity. Schistosity

1377-628: Is important for the reproduction of dragonflies and damselflies and the Wicklow mountain bogs also support insects such as pond skaters , whirligig beetles , water boatmen and midges as well as the common frog and the viviparous lizard . Wading birds such as snipes , curlews and golden plover feed in the waterlogged bogland. Due to drainage of water from the bogs as a result of human activity, most of Wicklow's peat has dried out too much for Sphagnum mosses to grow and moorland and heath vegetation has taken over. Active peat building

1458-897: Is joined by Cloghoge Brook between Lough Tay and Lough Dan and by the River Inchavore in Lough Dan. The Avonbeg rises on Table Mountain and the Three Lakes. The Avonmore and Avonbeg rivers join to form the River Avoca at the Meeting of the Waters in the Vale of Avoca , celebrated in the song The Meeting of the Waters by Thomas Moore . The Avoca is joined by the River Aughrim at Woodenbridge, sometimes referred to as

1539-844: Is joined by the Leoh, Knickeen and Little Slaney. Another of its tributaries, the River Derreen, rises on Lugnaquilla's southern side. Each of the main branches of the River Avoca —the Avonmore , the Avonbeg and the Aughrim rivers—have their origins in smaller tributaries, many of which rise in the Wicklow Mountains. The Glenealo, Glendasan and Annamoe rivers meet to form the Avonmore near Laragh . The Annamoe rises near Sally Gap and

1620-467: Is often very rich in mica (a mica schist ). Where the type of the original rock (the protolith ) is discernible, the schist is usually given a name reflecting its protolith, such as schistose metasandstone . Otherwise, the names of the constituent minerals will be included in the rock name, such as quartz-felspar-biotite schist . Schist bedrock can pose a challenge for civil engineering because of its pronounced planes of weakness . The word schist

1701-683: Is still occurring at some sites, most notably the Liffey Head Bog. Common heather (or ling) and bell heather are the most common moorland plants along with bilberry (or fraughan, as it is known in Ireland), bog cotton , deergrass and purple moor grass . Bird species found on the Wicklow moorland include red grouse , meadow pipit and skylark . Birds of prey found in the uplands include kestrels , hen harriers , merlins and peregrine falcons . The latter of these are protected species. The uplands are used for sheep grazing and so

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1782-450: Is that the Guinness family imported white sand and laid it over a beach on the northern shore of the lake to make it look like a pint of Guinness. The view into Lough Tay (with the cliffs of Luggala behind) is a popular scenic viewpoint in Wicklow and is easily viewed from one of the several car-parks along the R759 road (e.g. Ballinastoe Wood, and the J.B. Malone car-parks). A short hike up

1863-448: Is the sitka spruce , accounting for 58% of forest plantations, with lodgepole pine , Norway spruce , Scots pine , larch and Douglas fir also planted. Biodiversity is low in the conifer plantations because they are not native tree species. Broadleaf plantations are rare, accounting for less than 10% of forest. The young rivers in the upper glens are spawning grounds for salmon and brown trout . Arctic char , isolated in

1944-482: Is the orientation of grains in the surrounding medium-grained rock. The composition of the rock must permit formation of abundant platy minerals. For example, the clay minerals in mudstone are metamorphosed to mica, producing a mica schist. Early stages of metamorphism convert mudstone to a very fine-grained metamorphic rock called slate , which with further metamorphism becomes fine-grained phyllite . Further recrystallization produces medium-grained mica schist. If

2025-705: Is to be found on the hills near Baltinglass. The earliest known tribes to have controlled the Wicklow Mountains include the Dál Messin Corb , the Uí Mail , the Uí Theig and the Uí Briúin . One member of the Dál Messin Corb was Saint Kevin , who founded the monastery at Glendalough in the latter part of the 6th century. Kevin travelled to Glendalough from Hollywood , crossing the mountains via

2106-418: Is uncommon but can form from metamorphosis of sedimentary beds containing abundant organic carbon . This may be of algal origin. Graphite schist is known to have experienced greenschist facies metamorphism , for example in the northern Andes . Metamorphosis of felsic volcanic rock , such as tuff, can produce quartz- muscovite schist. In geotechnical engineering a schistosity plane often forms

2187-525: The Guinness Estate at Luggala, and has limited public access . The English name derives from the Irish name, Loch Té, meaning 'tea lake', because of its similarity to strong Irish tea. The nickname, 'The Guinness Lake' name comes from the former owners of the land. The lake is part of the former Guinness estate, owned by Arthur Guinness. Another claimed reason for it to be called the "Guinness Lake"

2268-475: The 1798 Rising . Rebel activity died out after the construction of the Wicklow Military Road at the start of the 19th century and the mountains began to attract tourists to the ruins at Glendalough and to admire the mountain scenery. The Wicklow Mountains continue to be a major attraction for tourism and recreation. The entire upland area is designated as a Special Area of Conservation and as

2349-465: The Bronze Age ( c.  2,500 –600 BCE). Iron ore extraction took place between the 12th and 17th centuries before being replaced by lead mining up to the mid-18th century. The principal activity from 1720 to the closure of the last mine in 1982 was copper extraction . Sulphur has also been extracted at certain times and, in smaller quantities, gold, silver and zinc . Lead mining has been

2430-595: The Caledonian orogeny at the start of the Devonian period and form part of the Leinster Chain, the largest continuous area of granite in Ireland and Britain. The mountains owe much of their present topography to the effects of the last ice age , which deepened the glens and created corrie and ribbon lakes. Copper and lead have been the main metals mined in the mountains and a brief gold rush occurred in

2511-566: The Glen of the Downs , the Devil's Glen and The Scalp . Ribbon lakes , such as Lough Dan and the lakes of Glendalough, also formed. The zone of collision between the continental plates that led to the formation of the Wicklow Mountains also led to mineralisation and the formation of Ireland's most significant metalliferous belt. The most important mining sites have been at Avoca and Glendalough . Mining has taken place at Avoca since at least

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2592-743: The Normans in the 12th century and its subsequent annexation to the Archdiocese of Dublin . It was burned by the English in 1398, although settlement there continued until the end of the 16th century. There are also important early Irish church sites in the Dublin foothills of the Wicklow Mountains at Rathmichael and Tully. In 1170, during the Norman invasion of Ireland , Strongbow and Dermot MacMurrough successfully laid siege to Dublin by following

2673-673: The Pleistocene epoch (2.6 million to 11,700 years ago). The ice deepened and moulded the valleys into the U-shape that characterises the Wicklow Glens, such as Glendalough and Glenmacnass. As the ice melted, small glaciers were left in corries where moraines now dam lakes such as at Loughs Bray and Nahanagan. Corries without lakes also occur, such as the North Prison and South Prison of Lugnaquilla. Escaping meltwater cut narrow rocky gorges at several locations including

2754-718: The Sally Gap (498 metres (1,634 feet)) and the Wicklow Gap (478 metres (1,567 feet)) being the highest road passes in the country. The Wicklow Mountains are primarily composed of granite surrounded by an envelope of mica - schist and much older rocks such as quartzite . The oldest rocks are the quartzites of the Bray Group that include Bray Head and the Little Sugar Loaf and Great Sugar Loaf mountains. These metamorphosed from sandstone deposited in

2835-523: The Thames Embankment in London. The Wicklow Mountains are the source of several major river systems . Since the thin blanket bog peats cannot hold great quantities of water, many of these rivers exhibit a flashy hydrography , filling rapidly after heavy rain. The River Liffey rises between the mountains of Kippure and Tonduff at Liffey Head Bog . One of the major tributaries of

2916-661: The "Second Meeting of the Waters". The Aughrim is formed at the junction of the Derry Water and the River Ow, the latter of which rises on Lugnaquilla. Several of these rivers have been dammed to create reservoirs to provide drinking water for the residents of Dublin and its environs. The first of these was the River Vartry, dammed to create the Vartry Reservoir near Roundwood in the 1860s. A second dam

2997-537: The 18th century. Several major river systems have their source in the mountains, such as the Liffey , Dargle , Slaney and Avoca rivers. Powerscourt Waterfall is the second tallest in Ireland at 121 metres (397 feet). A number of these rivers have been harnessed to create reservoirs for drinking water for Dublin and its surroundings. The Wicklow Mountains experience a temperate oceanic climate with mild, damp summers and cool, wet winters. The dominant habitat of

3078-484: The 1940s. A pumped-storage hydroelectricity plant was constructed at Turlough Hill between 1968 and 1974. Water is pumped up from Lough Nanahangan, a natural corrie lake, into an artificial reservoir on Tomaneena mountain and released at times of peak electricity demand. In common with the rest of Ireland, the Wicklow Mountains experience a temperate oceanic climate with mild, damp summers and cool, wet winters. Annual rainfall reaches 2,000 mm (79 inches) on

3159-563: The 2013 television historical drama series Vikings . Lough Tay, the Guinness Estate at Luggala and its owner Garech Browne feature in the 1991 film I Dreamt I Woke Up by John Boorman ( online ). Lough Tay features prominently in such movies as Zardoz (1974) and Excalibur (1981), by John Boorman . It also appears in the 2024 Netflix film Irish Wish . Wicklow Mountains The Wicklow Mountains ( Irish : Sléibhte Chill Mhantáin , archaic : Cualu ) form

3240-664: The Aughatinavought River, a tributary of the River Aughrim (since renamed the Goldmines River), that rises on the slopes of Croghan Kinsella mountain. During the subsequent gold rush in Wicklow , some 80 kilograms (180 pounds) of gold was recovered from the river by local prospectors, including a single nugget weighing 682 grams (24.1 ounces), the largest lump of gold ever discovered in Ireland and Britain. The mine workings were subsequently seized by

3321-480: The Bray Group and the main range. The Iapetus Ocean closed up completely at the end of the Silurian period (443–415 million years ago) and the Wicklow Mountains were uplifted during the main phase of the Caledonian orogeny at the start of the Devonian period (415–358 million years ago) when the continents of Baltica and Laurentia collided . The collision pushed up a large batholith of granite, known as

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3402-588: The British government who extracted a further 300 kilograms (660 pounds) of gold. Various attempts have been made to locate the motherlode on Croghan Kinsella but to no avail. Granite from the Wicklow Mountains has been used as a material for many buildings in Wicklow, Dublin city and beyond. According to Wyse Jackson and Caulfield, granite was reportedly first quarried in west Wicklow in the early 1700s "from several openings at Baltyboys near Blessington , and from 1740 in more significant volumes at Woodend and Threecastles nearby and then from Golden Hill quarry " near

3483-842: The EU Habitats Directive and as a Special Protection Area under the EU Birds Directive . The Dublin foothills of the Wicklow Mountains are managed by the Dublin Mountains Partnership (DMP), a group established in May 2008 with the aim of improving the recreational experience of users of the Dublin Mountains. Its members include representatives of state agencies, local authorities and recreational users. The DMP has restored paths and developed walking trails, orienteering courses and

3564-533: The English and assisted in the escapes of many of the hostages held by the English to guarantee the loyalty of the Irish clans . One such hostage was Red Hugh O'Donnell , who escaped from Dublin Castle on the night of 6 January 1592 in the company of Art O'Neill. The two men crossed the mountains in blizzard conditions, making for Fiach McHugh O'Byrne's stronghold at Glenmalure. Art O'Neill died from exposure during

3645-618: The Government announced the creation of the Wicklow Mountains National Park in 1990 to conserve the area's biodiversity and landscape. The park was officially established in 1991 and now encompasses an area of over 20,000 hectares (200 square kilometres; 77 square miles). In addition, the Wicklow Mountains (including areas outside the National Park) are classed as a Special Area of Conservation under

3726-637: The Leinster Chain: this is the largest continuous area of granite in Ireland and Britain and runs from the coast at Dún Laoghaire in County Dublin to New Ross in County Wexford and includes the Wicklow and Blackstairs Mountains . The heat generated by the collision metamorphosed the slates and shales surrounding the granite into schists which formed an aureole (shell) around the granite. The process of erosion has removed much of

3807-650: The Liffey, the River Dodder , rises nearby on slopes on Kippure . The King's River rises on Mullaghcleevaun and joins the Liffey near Blessington . The River Vartry rises on the slopes of Djouce mountain. Nearby, the River Dargle rises between Tonduff and War Hill, falling as the Powerscourt Waterfall , Ireland's second tallest waterfall at 121 metres (397 feet), over a cliff formed by

3888-568: The Powerscourt herd and are either sika deer or hybrid red-sika deer. Other mammals occurring include feral goats , mountain hares , badgers , stoats , otters , red squirrels , grey squirrels and bats . The Irish elk is an extinct species of deer that lived in the Wicklow Mountains c. 11,000 years ago, remains of which were discovered in great quantities in Ballybetagh Bog near Glencullen . Wolves were also once native to

3969-515: The Red Mountains. The Wicklow Mountains are the largest area of continuous high ground in Ireland, having an unbroken area of over 500 km (190 sq mi) above 300 metres (980 ft). They occupy the centre of County Wicklow and extend into Counties Dublin , Carlow and Wexford . The general direction of the mountain ranges is from north-east to south-west. They are formed into several distinct groups: that of Kippure in

4050-459: The Wicklow Gap. By the 8th century, Glendalough had grown into a substantial settlement of 500–1,000 people and an important site of learning and pilgrimage . Monasteries were often attacked, especially at times of disease or famine, and Glendalough's wealth made it a frequent target for both local tribes and, later, Norse invaders. The monastery declined in importance after the arrival of

4131-406: The Wicklow Mountains at 925 metres (3,035 feet) and the 13th highest in Ireland. It is also the highest peak in Leinster and is the only Irish Munro to be found outside of Munster . Kippure stands at 757 metres (2,484 feet). There are a total of 39 peaks over 600 metres (2,000 feet) in the Wicklow Mountains. There are only three passes through the mountains under 600 metres (2,000 feet) with

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4212-551: The Wicklow Mountains from the end of the Cromwellian period until the 1798 Rising . Although the main rebellion was quickly defeated, Irish rebels once again used the Wicklow Mountains as a hiding place and stronghold to attack the English for many years afterwards. Among their number was Michael Dwyer , a native of the Wicklow Mountains, born in the townland of Camara in the Glen of Imaal , and General Joseph Holt . Both men eventually surrendered and were transported to Australia. Determined to prevent any future rebel activity,

4293-562: The Wicklow Mountains. These tombs sit on many of the western and northern summits between Saggart in Dublin and Baltinglass in Wicklow, such as at Seefin and Seefingan . Archaeologist Geraldine Stout has suggested they had a territorial marking function, much like modern-day border posts. Other prehistoric monuments to be found in the uplands include stone circles , standing stones and rock art . The presence of standing stones at altitudes suggests they may have served route-marking purposes. The largest complex of hill forts in Ireland

4374-462: The Wicklow lakes following the end of the last ice age, have been recorded in Lough Dan and the lakes of Glendalough but are now believed extinct. A programme to reintroduce them into the Upper Lake at Glendalough commenced in 2009. The earliest evidence of human activity in the interior of Wicklow dates to around 4,300 BCE. Passage tombs , from the Neolithic period, are the earliest and most prominent feature of prehistoric Irish civilisation in

4455-404: The beautiful scenery made a profound impression on him and highlighted the small lake at Lugala. He returned half a century later with his friend Crompton Davies and they revisited Lugala but they looked over it from a wood set above the lake rather than the pebbly shore Russell remembered. This experience convinced Russell that one should not try and renew old memories. On the shore of Lough Tay

4536-399: The creation of the Wicklow Way , Ireland's first National Waymarked Trail , which opened in 1980 and crosses the Wicklow Mountains. The Wicklow Way has been joined by the Dublin Mountains Way and the Saint Kevin's Way pilgrim path, both of which also traverse parts of the mountains. On foot of concerns about environmental degradation and undesirable development of the Wicklow Uplands,

4617-425: The deep waters of the primeval Iapetus Ocean during the Cambrian period (542–488 million years ago). Layers of sediment continued to form slates and shales along the ocean floor mixed with volcanic rock pushed up as Iapetus began to shrink by the process of subduction during the Ordovician period (488–443 million years ago). These rocks now underlie the uplifted peneplain of the Vartry Plateau between

4698-456: The direction of greatest compression, also called the shortening direction, as platy minerals are rotated or recrystallized into parallel layers. While platy or elongated minerals are most obviously reoriented, even quartz or calcite may take up preferred orientations. At the microscopic level, schistosity is divided into internal schistosity , in which inclusions within porphyroblasts take a preferred orientation, and external schistosity , which

4779-410: The first boardwalked section of the path to the summit of Djouce mountain, to the J.B. Malone memorial stone (part of the 131-kilometre Wicklow Way trail), is another popular scenic viewpoint of the lough. The philosopher Bertrand Russell said that when he was young he twice visited Ireland with his Aunt Agatha he visited Lough Tay. He visited on his own and with Michael Davitt and he said that

4860-448: The ground waterlogged and leached nutrients from the soil, leading to the formation of peat . Mountain blanket bog is found in areas above 200 metres (660 feet) in altitude and where there are more than 175 days rainfall a year. The most important builders of peat are the Sphagnum bog mosses. Carnivorous plants such as sundews and butterworts are specific to boglands and bog asphodel and bog cotton are also common. Bog water

4941-441: The highest mountains with the more westerly peaks getting the most rainfall (for example, Djouce mountain, in the east, receives approximately 1,630 mm (64 inches), whereas Duff Hill , in the west, receives approximately 1,950 mm (77 inches) a year). June and July are generally the driest months and there is an average of four hours of sunshine a day over the entire year. Snow cover in winter can reach an average of 50 days

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5022-453: The invaders and the Wicklow Mountains became known as the terra guerre ("land of war"), as opposed to the terra pacis ("land of peace") of the settled lowlands. The valley of Glenmalure provided an almost unassailable refuge for the clans and English forces suffered heavy defeats there, first in 1274 and again in 1580 in the Battle of Glenmalure . The latter defeat was at the hands of Fiach McHugh O'Byrne , who led many attacks against

5103-445: The journey and Red Hugh had several toes amputated due to frostbite . A cross and a plaque to the north of Conavalla mountain mark the place where Art O'Neill perished and an annual walk is now held following in the two men's footsteps. The O'Byrnes' and O'Tooles' dominance finally came to an end with the Act of Succession of 1652 when their land was confiscated by the English Commonwealth . A prolonged period of peace reigned in

5184-544: The largest continuous upland area in Ireland . They occupy the whole centre of County Wicklow and stretch outside its borders into the counties of Dublin , Wexford and Carlow . Where the mountains extend into County Dublin, they are known locally as the Dublin Mountains ( Sléibhte Bhaile Átha Cliath ). The highest peak is Lugnaquilla at 925 metres (3,035 feet). The mountains are primarily composed of granite surrounded by an envelope of mica - schist and much older rocks such as quartzite . They were pushed up during

5265-424: The late 20th century. Similarly, quarries at Glencullen and Barnacullia in the "Dublin Mountains" provided stone for such buildings as the G. P. O. on O'Connell Street and the Industry and Commerce building on Kildare Street in Dublin. Barnacullia, on the slopes of Three Rock Mountain , supplied paving stones to Dublin Corporation , and the quarry at Dalkey supplied granite for Dún Laoghaire Harbour and

5346-417: The late 6th century by Saint Kevin , was an important centre of the Early Church in Ireland . Following the Norman invasion in the 12th century, the Wicklow Mountains became a stronghold and hiding place for Irish clans opposed to English rule. The O'Byrne and O'Toole families carried out a campaign of harassment against the settlers for almost five centuries. Later the mountains harboured rebels during

5427-527: The metamorphism proceeds further, the mica schist experiences dehydration reactions that convert platy minerals to granular minerals such as feldspars, decreasing schistosity and turning the rock into a gneiss. Other platy minerals found in schists include chlorite, talc, and graphite. Chlorite schist is typically formed by metamorphism of ultramafic igneous rocks, as is talc schist. Talc schist also forms from metamorphosis of talc-bearing carbonate rocks formed by hydrothermal alteration . Graphite schist

5508-405: The moorland is periodically burned to keep the growth of heather in check and encourage growth of grasses. Red deer , once native to Wicklow but hunted to extinction, were reintroduced on the Powerscourt Estate in the 18th century. Japanese sika deer were also imported by the Powerscourt Estate and have interbred with the red deer. All deer found in the Wicklow Mountains are descended from

5589-448: The mountains but were hunted to extinction in Ireland: the last wolf in Wicklow was killed at Glendalough in 1710. Widespread clearance of forest began in the Bronze Age and continued up until the early 20th century. Afforestation programmes began in the 1920s and accelerated in the 1950s with the widespread planting of conifer forest, especially in upland moorland areas previously considered unsuitable for planting. The dominant tree

5670-438: The mountains held by local clans : the north part of Wicklow and south Dublin was known as Cualann or Fir Chualann ("men of Cuala"), anglicised 'Fercullen', while the Glen of Imaal takes its name from the territory of Uí Máil . A sept of the O'Byrne family called the Gaval Rannall possessed the area around Glenmalure , known as Gaval-Rannall or Ranelagh . The mountains were also formerly known as Sliabh Ruadh or

5751-407: The north, on the boundary of Dublin and Wicklow; Djouce , Tonelagee , Camaderry and Lugnaquilla in the centre; Church Mountain and Keadeen Mountain in the west; and Croghan Kinsella to the south. To the east, separated from the rest of the range by the Vartry Plateau, is the group comprising the Great Sugar Loaf , Little Sugar Loaf and Bray Head . Lugnaquilla is the highest peak in

5832-637: The principal activity in the Glendalough valley and its neighbouring valleys of Glendasan and Glenmalure. Lead was first discovered in Glendasan in the early 19th century and the lead veins were later followed through Camaderry mountain to Glendalough. Mining on a smaller scale took place in Glenmalure. Ore from these mines was shipped to Ballycorus for processing. The last mine closed in 1957. In 1795, workers felling timber discovered gold near

5913-410: The proportionate fall in the uplands regions even greater as the populace deserted the marginal lands. The construction of the railways in the 19th century led to the development of tourism in the Wicklow Mountains. Visitors were taken by horse-drawn transport into the mountains from the railway station at Rathdrum . Glendalough quickly established itself as the most popular tourist destination and

5994-539: The rock contains abundant platy minerals, such as mica or chlorite . Grains of these minerals are strongly oriented in a preferred direction in schist, often also forming very thin parallel layers. The ease with which the rock splits along the aligned grains accounts for the schistosity. Though not a defining characteristic, schists very often contain porphyroblasts (individual crystals of unusual size) of distinctive minerals, such as garnet , staurolite , kyanite , sillimanite , or cordierite . Because schists are

6075-479: The route, although they were little used and soon fell into disrepair as the Wicklow Mountains soon ceased to be a centre of rebel activity after the road was completed. The census of 1841 recorded a population of 13,000 in the Wicklow uplands out of 126,143 persons in the county as a whole. Following the Great Famine , the census of 1891 showed that the population of County Wicklow had declined to 62,136 with

6156-470: The surrounding schist from the mountain tops, exposing the underlying granite. Some remnants of the schist roof remain on some of the mountain tops, most notably Lugnaquilla . The round granite-topped peaks contrast with the sharper schist peaks: for example, War Hill (granite) and Djouce (schist). The last major geological event to shape the Wicklow Mountains was the Quaternary glaciation during

6237-438: The uplands consists of blanket bog , heath and upland grassland . The uplands support a number of bird species, including merlin and peregrine falcon . The valleys are a mixture of coniferous and deciduous woodland. The mountains have been inhabited since Neolithic times and a number of typical monuments, in particular a series of passage tombs , survive to the present day. The monastery at Glendalough , founded in

6318-471: The uplands. Glendalough remains the most popular destination, receiving around one million visitors each year. Recreational activities in the mountains include walking, rock climbing , winter climbing, fishing and cycling. Hillwalking in the Wicklow Mountains was first popularised by J. B. Malone through a weekly column he wrote in the Evening Herald newspaper. Malone was later instrumental in

6399-456: The village of Manor Kilbride . In 1720, Trinity College Dublin accounts show that one John Bawnan was paid £ 11-10s-7d for "Blessington Stones delivered for work on the new kitchen" there. From 1824, the quarries at Ballyknockan provided material for buildings such as the Bank of Ireland on College Green in Dublin, Dún Laoghaire lighthouse and Liverpool Cathedral until they closed in

6480-525: Was added in 1924 to increase capacity. The River Dodder feeds the two Bohernabreena reservoirs in the northern foothills of the Wicklow Mountains at Glenasmole in County Dublin, which were constructed between 1883 and 1887 to supply water to the townland of Rathmines . The Poulaphouca Reservoir , on the River Liffey near Blessington, was constructed between 1938 and 1940. There are also two hydroelectricity plants at Poulaphouca, constructed during

6561-554: Was not established as a county until 1606; before that it had been part of County Dublin . During the medieval period, prior to the establishment of County Wicklow, the English administration in Dublin referred to the region as the Leinster Mountains. An early name for the whole area of the Wicklow Mountains was Cualu , later Cuala . The Irish name for Great Sugar Loaf mountain is Ó Cualann ("lump of Cuala"). There are also historic names for various territories in

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