Ffynnon Llugwy

Ffynnon Llugwy (English: Llugwy spring) is a lake in the Carneddau range of mountains in Snowdonia, North Wales.

Ffynnon Llugwy
Ffynnon Llugwy reservoir - geograph.org.uk - 199380.jpg
looking south
Ffynnon Llugwy is located in Snowdonia
Ffynnon Llugwy
Ffynnon Llugwy
LocationSnowdonia, North Wales
Coordinates53°8′45″N 3°57′23″W / 53.14583°N 3.95639°W / 53.14583; -3.95639Coordinates: 53°8′45″N 3°57′23″W / 53.14583°N 3.95639°W / 53.14583; -3.95639
Typenatural, reservoir
Primary outflowsAfon Llugwy
Basin countriesUnited Kingdom
Surface area40 acres (16.19 ha)

It lies at a height of about 1,786 feet (544 m) and covers an area of some 40 acres (16.19 ha). It has a maximum depth of 146 ft (45 m).[1]

Since the early twentieth century water has been taken from its outflow, Afon Llugwy to feed Llyn Cowlyd via a series of leats.

Since the mid 1970s the lake has additionally acted as a reservoir for Bangor and eastern Anglesey, which necessitated the laying of an 11-mile pipeline to the water treatment works at Mynydd Llandegai.[2]

Afon Llugwy which flows via Capel Curig and Betws-y-coed before becoming a tributary of the River Conwy.


  1. ^ The Lakes of Eryri, by Geraint Roberts, Gwasg Carreg Gwalch, 1985
  2. ^ Cyfrinachau Llynnoedd Eryri, by Geraint Thomas, y Lolfa, 2011