Caves Β· South Wales
Cwm Dwr (OFD)
In or near Ystradfellte.
Cwm Dwr (OFD) is a cave in the United Kingdom.

John Jenkins β CC BY-SA 2.0 via Wikimedia Commons licence
Plan your visit
- Typical visit
- 45 minβ1.5 h
- Free entry
- Dog-friendly
About
Cwm Dwr (OFD) is a named cave entrance in the United Kingdom. Coordinates: 51.8272Β°, -3.6595Β°. This entry is part of The Great Britain Guide, a free, ad-free, open-data tourist directory.
Photo gallery
Official information
Ogof Ffynnon Ddu, also known as OFD, is a significant cave system located in the Upper Swansea Valley of South Wales. It is the deepest cave in the UK and features a complex network of passages and chambers, showcasing unique geological formations and diverse underground wildlife.
Place summary
Cwm Dwr is a cave located in the parish of Tawe-Uchaf, South Wales, with the postcode SA9. This site features notable geological formations and is of interest to speleologists and those studying natural history.
AI-generated from the structured facts on this page (operator, designation, listing, era). Not a substitute for visiting.
- Coordinates
- 51.8272, -3.6595
- District
- Powys
- Parish
- Tawe-Uchaf
- Postcode
- SA9 1GQ
- Parliamentary constituency
- Brecon, Radnor and Cwm Tawe
- Official site
- en.wikipedia.org
Sources
- osm: n552317257 (ODbL)
Other places nearby

Ogof Ffynnon Ddu
Mountains & hills Β· 0.3 km

Penwyllt
Historic churches Β· 0.4 km

Ogof y nos hir, Ogof Ffynnon Ddu (OFD) top entrance
Caves Β· 0.7 km

Carreg Lwyd
Mountains & hills Β· 0.9 km

Ogof Ffynnon Ddu (OFD) bottom entrance
Caves Β· 1.0 km

Craig-y-Rhiwarth Hillfort
Vineyards Β· 1.1 km

Ogof Coed Cae
Caves Β· 1.2 km

Ogof-yr-Ardd
Caves Β· 1.2 km

Dan-Yr-Ogof Farm
Zoos & aquariums Β· 1.6 km

Brecon Beacons Camping & Caravan Park
Campsites Β· 1.7 km

Craig-y-Nos Castle
Castles Β· 1.7 km

Craig-y-Nos Castle
Castles Β· 1.7 km
Nearby
π· 5Mountains & hills Β· South Wales
Ogof Ffynnon Ddu
Ogof Ffynnon Ddu β cave in the Upper Swansea Valley in South Wales.
Historic churches Β· South Wales
Penwyllt
Penwyllt (Welsh: "wild headland") is a hamlet located in the upper Swansea Valley in Powys, Wales, lying within the Brecon Beacons National Park. A former quarrying village, quicklime and silica brick
Caves Β· South Wales
Ogof y nos hir, Ogof Ffynnon Ddu (OFD) top entrance
Ogof y nos hir, Ogof Ffynnon Ddu (OFD) top entrance is a cave in the United Kingdom.
Mountains & hills Β· South Wales
Carreg Lwyd
Carreg Lwyd β mountain in wales south. Elevation: 480 m.
Caves Β· South Wales
Ogof Ffynnon Ddu (OFD) bottom entrance
Ogof Ffynnon Ddu (OFD) bottom entrance is a cave in the United Kingdom.
Vineyards Β· South Wales
Craig-y-Rhiwarth Hillfort
Craig-y-Rhiwarth Hillfort β a UK vineyard in wales south, producing English or Welsh wine from cool-climate grape varieties.
Where to eat & stay near Cwm Dwr (OFD)
Places to stay
Campsites Β· South Wales
Brecon Beacons Camping & Caravan Park
Brecon Beacons Camping & Caravan Park β a campsite in wales south.
Campsites Β· South Wales
Cae Glas Camping
Cae Glas Camping β a campsite in wales south.
Campsites Β· South Wales
Brecon Beacons Caravan Touring Park
Brecon Beacons Caravan Touring Park β a campsite in wales south.
Places to eat & drink

Restaurants Β· South Wales
Harvester
Harvester β a restaurant in wales south.
More caves in this region
Caves Β· South Wales
Agen Allwedd (Ogof Gam)
Agen Allwedd (Ogof Gam) is a cave in the United Kingdom.
π· 3Frequently asked questions
- Where is Cwm Dwr (OFD)?
- Cwm Dwr (OFD) is in South Wales, United Kingdom (postcode SA9 1GQ), in the parish of Tawe-Uchaf.
- What is Cwm Dwr (OFD)?
- Cwm Dwr (OFD) is a cave in the United Kingdom.
- How do I get to Cwm Dwr (OFD)?
- Drivers can use postcode SA9 1GQ.
- Is Cwm Dwr (OFD) free to visit?
- Yes, Cwm Dwr (OFD) is free to enter.
- How do I get to Cwm Dwr (OFD)?
- Drivers can navigate to postcode SA9 1GQ. It sits within the Brecon, Radnor and Cwm Tawe parliamentary constituency.