Nant-y-Moch
Nant-y-Moch Reservoir is one of the most dramatic and remote bodies of water in Wales, a large upland reservoir sitting in the heart of the Cambrian Mountains at an elevation of around 320 metres above sea level. Created as part of a hydroelectric scheme managed by what is now Statkraft (formerly Central Electricity Generating Board), the reservoir holds an enormous volume of water drawn from the surrounding moorland and feeds the Rheidol hydroelectric power system, which winds down toward the coast at Aberystwyth. It is notable not only as a feat of mid-twentieth century civil engineering but as a landscape of wild, almost elemental beauty that draws walkers, birders, photographers and those simply seeking solitude far from the busier parts of Wales.
The reservoir was formed by the construction of Nant-y-Moch Dam, which was completed in 1964. Before the valley was flooded, the area contained ancient farmsteads and small habitations that had been part of the upland pastoral landscape of Ceredigion for centuries. The flooding of the valley to create the reservoir was a significant moment in the history of Welsh water infrastructure and also a source of cultural memory and loss, as communities and old farmsteads disappeared beneath the rising water — a story that resonates with other Welsh reservoir controversies, most famously Tryweryn, though Nant-y-Moch did not generate quite the same political storm. The name itself, meaning roughly "stream of the pigs" in Welsh, reflects the old agricultural character of the landscape before the waters came.
The dam itself is a concrete arch-gravity structure and stands as an impressive piece of engineering when viewed up close, curving across the valley with a quiet authority. The reservoir stretches for several kilometres to the north and east, its surface shifting colour depending on the weather — glittering silver under summer sun, an ominous lead-grey under approaching rain, and a deep, cold blue on clear winter mornings. The surrounding hillsides are largely open moorland covered in purple moor grass, heather and bog, giving the whole scene a wide-open, windswept quality that feels genuinely remote. On most days the wind is audible, and the call of red kites — which are plentiful in this part of Wales — can be heard wheeling overhead.
The surrounding landscape belongs to the Cambrian Mountains, sometimes described as the "Green Desert of Wales" for their vast, largely uninhabited character. This is one of the least densely populated parts of England and Wales, and the area around Nant-y-Moch has a sense of deep quiet that is increasingly rare. The nearby Pumlumon massif (also spelled Plynlimon) is the highest ground in the Cambrian range and is visible from the reservoir area; it is the source of both the River Severn and the River Wye, making it one of the most hydrologically significant upland areas in Britain. The small village of Ponterwyd lies a few kilometres to the east along the A44, and the town of Aberystwyth on Cardigan Bay is roughly 20 kilometres to the west.
Reaching Nant-y-Moch requires navigating narrow, single-track roads that branch off the A44 near Ponterwyd. The roads are passable for ordinary cars but drivers should be prepared for passing places and occasional farm traffic. There is a small car park near the dam itself, and from there visitors can walk along the road and tracks that skirt the reservoir's edge. There are no facilities on site — no café, no toilets, no visitor centre — so visitors should come self-sufficient with food, water and appropriate clothing. The weather on these uplands can change rapidly, and warm, waterproof layers are advisable even in summer. The best times to visit are late spring through early autumn for walking, though winter visits in clear conditions can be spectacular if challenging.
The area around Nant-y-Moch has become well known in recent years as a location for dark-sky observation, as the near-total absence of artificial light pollution makes the night skies exceptional by UK standards. The Cambrian Mountains as a whole are under discussion as a potential Dark Sky Reserve, and Nant-y-Moch sits near the heart of this proposed area. For wildlife enthusiasts the reservoir and its surroundings are home to red kites, peregrine falcons, merlins, and during the right seasons, passage waders. The red kite population of this part of Wales is one of the oldest continuously surviving populations in the UK — these birds never became extinct here as they did in England and Scotland — and seeing them soar over the open water of the reservoir is one of the signature experiences of a visit to this part of Ceredigion.