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Burial Chamber

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Conway Falls
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Dolwyddelan Castle
Electric Moutain
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Llanberis
Llanberis Pass
Llyn Cwellyn
Llyn Dinas
Llyn Elsi
Llyn Glaslyn
Llyn Llydaw
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Llynnau Mymbyr
Mount Snowdon
Nant Gwynant Pass
Swallow Falls
Sygun Copper Mines

Llyn Cwellyn


OS Grid Ref:- SH 5555


Llyn Cwellyn is a large reservoir situated by A4085, near to the village of Rhydd Du, situated on the Afon Gwyrfai in Nant y Betws between the Snowdon Massif and Mynydd Mawr. The reservoir provides drinking water to parts of Gwynedd and Anglesey.

Llyn Cwellyn

In times past referred to as Llyn Quellyn, the lake is very deep and is one of the few in Wales to contain a natural population of Artic char, it also contains trout. Llyn Cwellyn is a glacial moraine lake formed during the last Ice Age and is now dammed at the northern end, near to the small village of Betws Garmon.

Castell Cidwm, or Wolf Castle as it is known in English, is situated on towering cliffs at the northern end of the lake, it was once thought to be the remains of an ancient Celtic fort, but is now known to be a totally natural rock formation. Legend states it was once held by a robber chief who is reputed to have murdered a brother of the Roman Emperor Constantine.


A walk to Mynydd Mawr from Rhydd Du




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