Corn Du, Mountain summit in Brecon Beacons National Park, Wales.
Corn Du is a mountain summit in the Brecon Beacons of Wales, sitting at 873 meters (2,864 feet) with a notably flat, anvil-shaped top. Its rock face shows clearly layered strata, giving the peak a clean, broad outline when seen from the surrounding valleys.
A Bronze Age cairn sits at the top, built over a central burial cist, showing that people gathered at this summit long before recorded history. This makes the peak one of the oldest marked sites in the Brecon Beacons.
The name Corn Du comes from Welsh and means Black Peak, a reference to how the rock looks darker when clouds and rain move across the summit. Standing at the top on an overcast day, you can see exactly why this name was given.
The main paths to the summit are maintained by the National Trust and are clearly marked, making the walk accessible to most hikers. Weather on the peak can change fast, so bring warm and waterproof layers even in summer.
Just below the summit lies Llyn Cwm Llwch, one of the very few natural lakes in the Brecon Beacons, formed by a glacier during the last ice age. It is clearly visible from the ridge and adds a striking contrast to the bare rock around it.
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