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Waterfall Country (Wales)
Waterfall Country (or sometimes Waterfalls Country) is the name given to an area around the head of the Vale of Neath in South Wales where an unusually large number of spectacular and publicly accessible falls are to be found. The area is loosely defined but generally includes the group of falls on the Nedd Fechan, Pyrddin, Hepste and Mellte rivers, all of which lie in the country between the villages of Pontneddfechan and Ystradfellte in the southern part of the Brecon Beacons National Park. All of these falls lie within or on the boundary of the modern county of Powys, former Brecknockshire. A few miles further west are Henrhyd Falls on the Nant Llech, a tributary of the Tawe and to the southwest are Melin Court Falls on the Melin Court Brook, a tributary of the River Neath. These, along with Aberdulais Falls on the Dulais, a further tributary of the Neath are also encompassed by the term 'Waterfall/s Country' by some writers.
Collectively the falls are one of the most popular natural attractions in South Wales, a fact which has brought about problems of erosion in the vicinity of many of the falls. Most occupy locations designated as sites of special scientific interest or as special areas of conservation which aim to protect the biodiversity and geodiversity of these sites. The designations place a duty on the landowners and managers to protect the sites and so various erosion control measures have been put in place in an attempt to counter the worst problems.
==Origins==
Virtually all of the falls occur on tributaries of the River Neath occupying valleys that have been deeply incised into the landscape. It is suggested that overdeepening of the Vale of Neath by glacier ice during the succession of ice ages has resulted in these tributaries cutting down into their own beds as they adjust to a base level lower than in pre-glacial times. The underlying geology is a generally southerly dipping succession of Carboniferous age sandstones and mudstones assigned by geologists to the Marros Group and formerly referred to as the Millstone Grit Series. Preferential erosion, whereby the less resistant mudstones have been more readily removed by the passage of water, often following various forms of weathering, has left sandstones forming the lips of the falls. The siting of individual falls is closely linked in many cases to the presence of northwest–southeast–aligned faults that have brought different lithologies into proximity.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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