Rooftop of Wales — Elan Valley to Rhayader via the Cambrian Mountains High Moorland

The Elan Valley reservoir system was built between 1893 and 1904 to supply Birmingham with water, and the estate roads and forestry tracks that thread around the dams and up onto the Cambrian moorland above them are some of the most atmospheric driving in Wales. From Rhayader, head west on the B4518 into the estate, then pick up the gravel tracks climbing past Claerwen Reservoir toward the open moorland plateau — soft bog flanks the track on both sides, drainage channels cut across the surface, and on a clear day you can see the Brecon Beacons to the south and Pumlumon to the north. The highest sections run above 500 metres across genuine open moorland, with no fences, no phone signal, and the kind of silence that Wales does better than almost anywhere in Europe.

The tracks are classed as public byways and Unclassified County Roads, so they are legally open to vehicles, but they are narrow, soft-surfaced, and badly churned after wet weather — standard condition for Wales. A short-wheelbase high-clearance 4WD handles it fine in dry summer conditions; anything longer will struggle on the tighter byway sections near the reservoir dam walls. Go July through September for the firmest ground. No permit required, but the Elan Valley Estate restricts access to some tracks — check with Elan Valley Trust before venturing off the main estate roads. Carry fuel from Rhayader; there is nothing on the plateau. This is not dramatic by Himalayan standards, but for raw, lonely moorland atmosphere within four hours of London it is hard to beat.