Cwmdu is a small village situated in the heart of the Black Mountains in Powys, Wales. Its name is derived from the Welsh language "Cwm Du", which means 'Black Valley'. It is located on the A479 Talgarth to Tretower road.
Cwmdu has several public facilities, including a park, a garage, a church dedicated to St. Michael and Archangels , a campsite, a village school  which was visited by Prince Charles in the summer of 2006, a village pub, the Farmers Arms  and a cafe, the Mynydd-Ddu Tea Room.
Cwmdu attracts many tourists every year, who mainly consist of hikers hillwalking through on the Beacons Way . Cwmdu is an attractive hiking destination as it is situated in the heart of the Black Mountains, and is only about 12 miles away from the Brecon Beacons; the highest mountain range in South Wales and within the region's National Park.
Nearby towns include Crickhowell; a small market town which is famous for its beautiful 16th century river bridge across the River Usk and a range of quaint shops. Abergavenny is also found nearby over the border with Monmouthshire; a larger market town than Crickhowell, it is also popular with ramblers because of its 'Three Peaks'; the Sugar Loaf Mountain, Wales, the Blorenge and the Skirrid.
In 2012 Cwmdu was selected as the site for the bi-annual AstroCamp, the first of which took place on the weekend of 7–9 September 2012. This saw a large gathering of astronomers at the campsite and Farmer's Arms Pub and was televised by the BBC The Sky at Night program the following October. The next Astrocamp is planned for the weekend of 3–6 May 2013.
- Satellite map at Maplandia
- Description of the Cwmdu area from a local tourist website
- Cwmdu on Genuki website
- The prehistory and history of the locality
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