Llyn Dulyn

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Llyn Dulyn
Llyn Dulyn - geograph.org.uk - 84859.jpg
LocationSnowdonia, North Wales
Coordinates53°10′49″N 3°56′45″W / 53.18028°N 3.94583°W / 53.18028; -3.94583Coordinates: 53°10′49″N 3°56′45″W / 53.18028°N 3.94583°W / 53.18028; -3.94583
Typenatural lake, reservoir
Primary outflowsAfon Dulyn
Basin countriesUnited Kingdom
Surface area33 acres (13 ha)
Max. depth189 ft (58 m)

Llyn Dulyn (Welsh: Black lake) is a lake on the edge of the Carneddau range of mountains in Snowdonia, North Wales.

The lake covers an area of only 33 acres (130,000 m2), yet is extremely deep - it reaches to a depth of 189 feet (58 metres). Less than a kilometre to its south lies the smaller Llyn Melynllyn.

Cliffs rise steeply from the lake edge up to the summits of Garnedd Uchaf and Foel Grach, giving it a dark brooding appearance - hence its name.

The lake has a dam, originally built in 1881, to increase its water capacity, but it has been altered several times since. As a reservoir Dulyn (along with Melynllyn) provides water for the town of Llandudno. The pipes cross the River Conwy at Tal-y-Cafn bridge.

The outflow from the lake is called Afon Dulyn, and this stream also feeds water into neighbouring Llyn Eigiau. Afon Dulyn flows north-east, passing Tal-y-bont before joining the River Conwy.

In June 1284 the lake was the setting for the court of King Edward I of England for victory celebrations, following his defeat of Llywelyn ap Gruffudd, with an Arthurian theme, including the King’s 45th Birthday[1]

A number of superstitions are connected with the cwm, which has also been the site of a number of aeroplane crashes.[2]

In 1944 an American Dakota aircraft crashed into the cliffs above the lake killing all four crew.[3]


  1. ^ Marc Morris. 2009. A Great and Terrible King. London: Windmill Books. 364.
  2. ^ The Lakes of Eryri by Geraint Roberts, Gwasg Carreg Gwalch, 1985
  3. ^ "Douglas C-47B 43-48473 of the 27th Air Transport Group flew into the cliffs above Llyn Dulyn in the Carneddau while flying form Le Bourget to Burtonwood on the 11th November 1944". www.peakdistrictaircrashes.co.uk. Retrieved 7 October 2017.
  • "The Lakes of North Wales" by Jonah Jones, Whittet Books Ltd, 1987
  • "The Lakes of Eryri" by Geraint Roberts, Gwasg Carreg Gwalch, 1985