Llyn y Fan Fawr

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Llyn y Fan Fawr
Llyn y Fan Fawr.jpg
Llyn y Fan Fawr is located in Powys
Llyn y Fan Fawr
Llyn y Fan Fawr
LocationPowys, Wales
Coordinates51°52′52″N 3°42′0″W / 51.88111°N 3.70000°W / 51.88111; -3.70000Coordinates: 51°52′52″N 3°42′0″W / 51.88111°N 3.70000°W / 51.88111; -3.70000
Primary outflowsNant y Llyn, tributary of River Tawe
Basin countriesUnited Kingdom
Surface elevation605 m (1815 feet)

Llyn y Fan Fawr (Welsh: 'great lake (near) the peak')[1] is a natural lake in the county of Powys, Wales. It lies at the foot of Fan Brycheiniog,[2] the highest peak of the Black Mountain (WelshY Mynydd Du) range within the Brecon Beacons National Park. Created as a result of glacial action,[3] it is one of the largest glacial lakes in southern Wales.[4] The lake is roughly rectangular in shape with its long axis oriented roughly north-south.[citation needed]

The lake from a small beach

The surface of Llyn y Fan Fawr lies at about 1815 feet or 605m above sea level.[5][6] Its primary outflow is to the River Tawe.[7] Much of the land around the lake is peaty and thus wet underfoot.


  1. ^ Owen, Hywel Wyn; Morgan, Richard (2007). Dictionary of the Place-names of Wales (First ed.). Llandysul: Gomer Press. p. 300. ISBN 9781843239017.
  2. ^ Andrew Davies; David Whittaker (9 September 2010). Walking on the Brecon Beacons. Cicerone Press Limited. pp. 191–. ISBN 978-1-84965-346-6.
  3. ^ Geological Survey of Great Britain (1932). Memoirs. England and Wales: Explanation of Sheet. H.M. Stationery Office.
  4. ^ Derek Ratcliffe (26 January 2012). A Nature Conservation Review: Volume 1: The Selection of Biological Sites of National Importance to Nature Conservation in Britain. Cambridge University Press. pp. 236–. ISBN 978-0-521-20329-6.
  5. ^ Hans Luther; Julian Rzóska (1971). Project Aqua: A Source Book of Inland Waters Proposed for Conservation. International Biological Programme. ISBN 978-0-632-08730-3.
  6. ^ Ordnance Survey Explorer map OL12 'Brecon Beacons National Park: western area'
  7. ^ Bye-gones: Relating to Wales and the Border Counties. Printed at the Caxton works. 1894. pp. 504–.

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