River Rhiangoll: Difference between revisions
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[[File:The Rhiangoll north of Cwmdu - geograph.org.uk - 1123121.jpg|thumb|The Rhiangoll north of Cwmdu]] | |||
{{county|Brecknockshire}} | |||
The '''Rhiangoll''' is a river in the [[Black Mountains]], within [[Brecknockshire]]. The course of the river is also within the [[Brecon Beacons]] National Park. | |||
The riser rises on the western slopes of [[Waun Fach]] in the Black Mountains and drops steeply down to the west into the north-south valley through which the A479 runs between [[Talgarth]] and the hamlet of [[Tretower]] and through the village of [[Cwmdu, Brecknockshire|Cwmdu]]. | |||
The Rhiangoll is joined by various minor tributary streams on its left bank including the [[Ffinnant]], [[Nant yr Ychen]], [[Nant-y-fedw]] and [[Nantygarreg]], all of which rise on the flanks of the ridge extending between [[Pen Trumau]] and [[Pen Gloch-y-pibwr]]. Two tributary streams flowing from [[Mynydd Troed]] and [[Mynydd Llangorse]] enter on its right bank as does [[Nant Ewyn]] east of the village of [[Bwlch]]. | |||
The Rhiangoll enters the [[River Usk]] near Glanusk Bridge a mile south of Tretower.<ref>British Geological Survey 1:50,000 map sheet 214 'Talgarth' & accompanying sheet explanation</ref> | |||
==Paleogeology== | |||
The main valley was excavated by glacial ice during the course of the ice ages as it breached the watershed at Pengenffordd. Its broad lower section was influenced by the merging of the Rhiangoll valley ice with that of the main Usk Valley glacier which swept down past Bwlch. | |||
==Outside links== | |||
{{commons|River Rhiangoll}} | |||
*Location map: {{wmap|51.87596|-3.17685|zoom=14}} | |||
*{{geograph|5078286|Rhiangoll Valley}} | |||
==References== | |||
{{Reflist}} | |||
[[Category:Rivers of Brecknockshire|Rhiangoll]] | |||
Latest revision as of 23:14, 22 February 2018
The Rhiangoll is a river in the Black Mountains, within Brecknockshire. The course of the river is also within the Brecon Beacons National Park.
The riser rises on the western slopes of Waun Fach in the Black Mountains and drops steeply down to the west into the north-south valley through which the A479 runs between Talgarth and the hamlet of Tretower and through the village of Cwmdu.
The Rhiangoll is joined by various minor tributary streams on its left bank including the Ffinnant, Nant yr Ychen, Nant-y-fedw and Nantygarreg, all of which rise on the flanks of the ridge extending between Pen Trumau and Pen Gloch-y-pibwr. Two tributary streams flowing from Mynydd Troed and Mynydd Llangorse enter on its right bank as does Nant Ewyn east of the village of Bwlch.
The Rhiangoll enters the River Usk near Glanusk Bridge a mile south of Tretower.[1]
Paleogeology
The main valley was excavated by glacial ice during the course of the ice ages as it breached the watershed at Pengenffordd. Its broad lower section was influenced by the merging of the Rhiangoll valley ice with that of the main Usk Valley glacier which swept down past Bwlch.
Outside links
 |
("Wikimedia Commons" has material about River Rhiangoll) |
References
- ↑ British Geological Survey 1:50,000 map sheet 214 'Talgarth' & accompanying sheet explanation