| 词条 | Nant Gwys |
| 释义 |
The Nant Gwys is a river flowing off the Black Mountain (Y Mynydd Du) in Powys, Wales. Its tributaries Gwys Fawr and the Gwys Fach flow south from Banwen Gwyn and Bwlch y Ddeuwynt respectively and join forces to form the Nant Gwys proper which then flows for about 5 km / 3 mi to its confluence with the Afon Twrch at Cwm-twrch-Uchaf. The upper reaches of the river and its tributaries lie within the Brecon Beacons National Park (Parc Cenedlaethol Bannau Brycheiniog) and within Fforest Fawr Geopark.[1] The river is one of several which run down the southward directed dip-slopes of the Black Mountain (Y Mynydd Du) passing from the Millstone Grit outcrop onto the mudstones of the Carboniferous Coal Measures.[2] The name translates from Welsh as 'sow stream', presumably in reference to the neighbouring Afon Twrch or 'boar river'. External links
References1. ^Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area {{coord|51.78685|N|3.80213|W|type:river_region:GB|display=title}}{{Powys-geo-stub}}{{Wales-river-stub}}2. ^British Geological Survey 1:50,000 map sheets 230 'Ammanford' & 231 'Merthyr Tydfil' & memoir accompanying latter 3 : Black Mountain, Wales|Rivers of the Brecon Beacons National Park|Rivers of Powys |
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