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・ Cwm Clydach National Nature Reserve
・ Cwm Clydach RSPB Reserve
・ Cwm Craig-ddu Quarry
・ Cwm Crymlyn Road Section
・ Cwm Cydfin, Leckwith
・ Cwm Cyffog
・ Cwm Dewi
・ Cwm Doethie – Mynydd Mallaen
・ Cwm Du Woodlands
・ Cwm Dyli
・ Cwm Felin Boeth Formation
・ CWM FX
・ Cwm Glo
・ Cwm Gwaun
・ Cwm Head
Cwm Idwal
・ Cwm Llwyd Fault
・ Cwm Llyfnant
・ Cwm Nantcol
・ Cwm Penmachno
・ Cwm Pennant Fault
・ Cwm Prysor railway station
・ Cwm railway station
・ Cwm Rhondda
・ Cwm Risca Meadow
・ Cwm Silicon
・ Cwm Taf Fechan Woodlands
・ Cwm Taf Health Board
・ Cwm Talwg
・ Cwm Teigl Halt railway station


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Cwm Idwal : ウィキペディア英語版
Cwm Idwal

Cwm Idwal is a hanging valley in the Glyderau range of mountains in northern Snowdonia, the national park in the mountainous region of North Wales. Its main interest is to hill walkers and rock climbers, but it is also of interest to geologists and naturalists, given its combination of altitude (relatively high in UK terms), aspect (north-facing) and terrain (mountainous and rocky). In a 2005 poll conducted by Radio Times, Cwm Idwal was ranked the 7th greatest natural wonder in Britain.
==Geology==

Cwm Idwal is a spectacular product of glaciation, surrounded by high crags, screes, moraines and rounded rocks, with a lake on its floor (Llyn Idwal). Cwm Idwal comprises volcanic and sedimentary rock which was laid down in a shallow Ordovician sea, and later folded to give rise to the distinctive trough-shaped arrangement of strata known today as the Idwal Syncline. This fold in the rock is visible today, thanks to the layering of the sedimentary rocks. The area was then eroded by glacial action to form the classic semicircular valley.

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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