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About this place
Llyn Dinam is a shallow lake on the west side of Anglesey (Ynys Môn), Wales, beside RAF Valley airfield and close to the village of Valley. It is the northernmost lake in the Llynnau y Fali group and a protected site, valued for its birdlife and aquatic plants.
What is Llyn Dinam?
The lake belongs to Llynnau y Fali, a Site of Special Scientific Interest covering roughly 100 hectares. The water itself also carries Special Area of Conservation status, over an area of about 36 to 37 hectares. A management plan from the Welsh conservation authorities describes it as the least disturbed by human activity of the lakes nearby.
It is classed as a coastal eutrophic lake. Common reed and club-rush line the shore, water-lilies grow in a sheltered inlet on the western side, and the water holds stoneworts and several kinds of pondweed.
What can you see?
Birds are the main reason to come. The western section of the RSPB Valley Wetlands reserve takes in part of Llyn Dinam, along with Llyn Penrhyn and Llyn Treflesg. Look for tufted duck, pochard, shoveler, gadwall and grebes on the open water. In spring the reedbeds fill with reed and sedge warblers, and a bittern may be heard booming. Great crested grebes perform courtship displays and nest here. In winter the lakes can hold hundreds of wildfowl, including goldeneye, tufted duck, shoveler and wigeon.
How do you get there?
The reserve lies south-east of Valley in the community of Llanfair-yn-Neubwll, next to RAF Valley. There is a car park and a bird hide. Buses 4 and X4 serve the area, and Valley railway station is about 3 miles away.
When should you visit?
Spring suits breeding birds and reedbed song, while winter brings the largest duck flocks. Bring binoculars and waterproof, warm clothing, as Anglesey can be windy.
Frequently asked questions
Is Llyn Dinam the same as Llyn Traffwll?
No. It is a separate lake, part of the Llynnau y Fali group by RAF Valley.
Is the lake protected?
Yes. It forms part of the Llynnau y Fali SSSI, and the lake itself is a Special Area of Conservation.
Are there waterbirds?
Yes, both breeding species such as great crested grebes and wintering ducks.
Can I reach it without a car?
Yes. Take bus 4 or X4 towards Valley, or the train to Valley station, which is about 3 miles away.
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