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Ogof Ffynnon Ddu (Welsh for cave of the black spring), also known informally as OFD, is a cave under a hillside in the area surrounding Penwyllt in the Upper Swansea Valley in South Wales. It is the second longest cave in Wales and the deepest in the United Kingdom.
The cave is about 7 km (4 mi) in length and is renowned as one of the best-decorated caves in Wales. It contains some early short crawling sections (and what is known as an arduous and uncomfortable boulder choke) and some wet passages with voluminous quantities of mud before developing into a series of large sections lavishly decorated with mud and calcite formations.
Dan yr Ogof (Welsh pronunciation: [ˈdan ər ˈoːɡɔv]), at the National Showcaves Centre for Wales, is a 17-kilometre (11 mi) long cave system in south Wales, about 5 miles (8 km) north of Ystradgynlais and 15 miles (24 km) southwest of Brecon, in the Brecon Beacons National Park.
The deepest cave in Wales and the UK is Ogof Ffynnon Ddu, 274.5 metres (901 ft) deep and containing around 50 km (31 mi) of passageways. [ 2 ] The deepest cave in England is the Three Counties System which is 252 metres (827 ft) deep between the entrance of Large Pot, and the deepest point reached by diving in Gavel Pot.
The most celebrated cave on Mynydd Llangynidr is Ogof Fawr or Chartist Cave (or sometimes 'Chartists Cave'), so named as it was reputed to be a hiding place for the Chartists of South Wales, situated 500m to the east of the top of Garn Fawr. The Carno Adit is a major horizontal tunnel driven beneath the mountain from the south.
This is a list of caves and cave systems in the state of New South Wales, Australia. Caves. Abercrombie Caves; Ashford Caves; Bendethera Caves; Billys Creek Caves;
The caves are located in the Nant Glais Valley, to the west of the village of Vaynor in Merthyr Tydfil County Borough. [1]There are six caves at the site. The two largest, Ogof y Ci and Ogof Rhyd Sych, measure approximately 1,000–1,600 metres (3,300–5,200 ft) and 2,000 m (6,600 ft) in length respectively.
The Cathole Cave, Cat Hole Cave or Cathole Rock Cave, is a steep limestone outcrop, about 200 yards (180 m) north of the cromlech along the Parc le Breos Cwm valley and near the top of the gorge, about 50 feet (15 m) from the valley floor. The cave is a deep triangular fissure penetrating the hillside and narrowing towards the top.