At a glance
Llyn Aled is a remote water supply reservoir on the Mynydd Hiraethog moorland plateau, 3 miles from Llansannan in Conwy county — free open access, no facilities, and no crowds. Red grouse, curlew, red kite, and peregrine on the surrounding moors; wildfowl on the water in winter. A car is essential; walking boots and waterproofs required. The quietest and least-known of North Wales's significant upland lakes.
About Llyn Aled
Mynydd Hiraethog — the ancient upland plateau between the Vale of Clwyd and the Conwy Valley — is one of the larger pieces of Welsh moorland that most visitors to North Wales never see. The mountains of Snowdonia draw the attention westward; the coast draws it north; and the Hiraethog plateau, lacking the dramatic elevation and named peaks that make a landscape legible to the tourist industry, is passed over by routes heading to more immediately recognisable destinations. Llyn Aled sits at the centre of this overlooked landscape, a reservoir of modest size and considerable quietness, its surface reflecting the sky and the surrounding moor in the way that upland lakes do when there is no wind and nothing else competing for the attention.
The reservoir was constructed in the early 20th century to supplement the water supply for the communities of the Conwy Valley and the north coast. Its catchment is the high peat bog and heather moorland of the Hiraethog plateau — ground that absorbs rainfall slowly and releases it through the soft-water, tannin-stained streams characteristic of upland Wales. The resulting lake is amber-dark in certain lights, edged with bog cotton and rush, and backed by the open moorland that continues, largely uninterrupted, to the horizon. The infrastructure of the reservoir — the dam, the valve house, the access track — is functional rather than decorative, and the surrounding landscape absorbs it without difficulty.
For those who come to Llyn Aled, the attraction is precisely what it lacks: the car parks, the waymarked trails, the interpretation boards, the other walkers. The moorland birds — curlew in spring calling from the bog, red grouse erupting from the heather with their territorial alarm, the high circling of red kite above the ridge — are present in the numbers that attend places where people are few. The walk around the reservoir and out onto the open plateau beyond requires only a map, appropriate clothing, and the willingness to spend time in a landscape whose qualities are registered by the ear and the quality of the air as much as by any conventional visual spectacle. It is the kind of place that people who know North Wales well return to when they are tired of the places everyone else goes.
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Frequently asked questions
Llyn Aled is a moorland reservoir in the Hiraethog hills (Mynydd Hiraethog), approximately 3 miles north of the village of Llansannan in Conwy county, North Wales. It sits on the high plateau of the Denbigh Moors at around 400 metres above sea level, in the catchment of the River Aled which drains south through Llansannan into the Conwy Valley. The reservoir is managed by Dŵr Cymru Welsh Water and the surrounding moorland is a mixture of open bog, heather, and rough grazing.
Yes. The reservoir can be walked around on a circuit using the access tracks and moorland paths that cross the Hiraethog plateau. The terrain is open and largely trackless in places, with the ground varying from firm grass to wet bog depending on recent rainfall. Walking boots and waterproofs are essential. The circuit of the reservoir takes 1–2 hours at a comfortable pace. The open moorland beyond the reservoir extends across the Mynydd Hiraethog plateau towards Llyn Brenig to the east.
Llyn Aled and the surrounding moorland support a range of upland bird species typical of the Hiraethog plateau. Red grouse are resident on the heather moorland. Curlew, golden plover, and lapwing are present in spring and summer on the open bog. Peregrine falcons patrol the high ground. Red kite are often visible circling overhead. In winter the reservoir and its margins attract wildfowl including teal, wigeon, and occasional diving ducks. The combination of open water and moorland habitat makes it a productive site across all seasons.
Llyn Aled is a water supply reservoir managed by Dŵr Cymru Welsh Water, and swimming in water supply reservoirs in Wales is generally not permitted. Visitors should respect access restrictions at the water's edge and treat the reservoir as a place for walking and birdwatching rather than swimming. Those seeking wild swimming in upland lakes in North Wales have better alternatives on the open access land of Snowdonia, where rivers and natural lakes rather than managed reservoirs are available.
Llyn Aled is genuinely remote by the standards of North Wales tourist attractions. The approach requires a car and involves minor roads that are not signposted from main routes; there are no facilities, no visitor infrastructure, and no mobile phone signal in parts of the surrounding moorland. This is part of its appeal for visitors seeking solitude and the quality of quiet that the more-visited lakes of Snowdonia can rarely provide on a summer weekend. It rewards visitors who are comfortable with open moorland and self-sufficient in navigation.
Mynydd Hiraethog (the Denbigh Moors) is a high moorland plateau between the Vale of Clwyd and the Conwy Valley in Denbighshire and Conwy county, covering roughly 25,000 hectares of upland bog, heather moorland, and rough grazing. It is one of the least-visited upland areas in North Wales despite its scale, partly because it lacks the dramatic mountain forms of Snowdonia and partly because public access routes are less well-marked than in the national park. Llyn Aled and the larger Llyn Brenig reservoir are its principal focal points for visitors, and together they form the core of the Mynydd Hiraethog SSSI and the designated dark sky area.