We use cookies to provide you with the best experience on our website. No personal information is stored. If you continue without changing your cookie settings, we'll assume that you are happy to receive all cookies on the website. Please refer to our privacy statement for further information on our cookies.

Countryside Council for Wales (CCW) home page | Sponsored by Welsh Assembly Government NRW Logo

Countryside Council for Wales
Home Page Please note - A new body, Natural Resources Wales has taken over all functions and services previously carried out by Countryside Council for Wales. While the Natural Resources Wales website continues to be developed, some online services will continue to be provided on this web site.

Llyn Alaw

This shallow drinking water reservoir was built in the 1960s over the former peatland of Cors y Bol and now constitutes Angelsey's largest lake, supporting various waterfowl. The draw-down zone around the perimeter supports a number of interesting plants including needle spike rush and pillwort.

Llyn Alaw SSSI aerial photo

© This orthophotography has been produced by COWI A/S from digital photography captured by them in 2006. Licensed by the Welsh Assembly Government's Department for Environment, Planning and Countryside.

Managing this site

Llyn Alaw is owned by Dŵr Cymru/Welsh Water. The special features of this SSSI and CCW’s views about site management have been summarised in a Site Management Statement, addressed to the owners and managers of the land. The statement can be found in the resource section below.

Access information

There are a number of public footpaths allowing access to the lake. There is a visitor centre at the western end near the dam from where a recreational trout fishery operates. For detailed maps and information regarding access visit our access map via the resource section below.

Other information

Llyn is ‘lake’ and alaw means ‘water-lily’.




Access map

This is a link to Outdoor Wales on Line

Our other sites

Follow Us


twitter logo


Follow our tweets


Youtube Logo


Subscribe to our channel


Flickr Logo


Browse our gallery


Designated Sites Search

Advanced Search
Contact the Team
Email address
Postal address
The landscapes team [SSSI]
C/O Enquiries
LL57 2DW
Telephone number
0845 1306229
Page feedback