- Sources
{{Orphan|date=February 2009}}{{Infobox Cave
| name = Pwll Dwfn
| photo = Pwll Dfwn.jpg
| photo_caption = Pwll Dfwn entrance
| location = Tawe Valley, South Wales
| depth = 97
| length = {{convert|305|ft|m|0}}
| grid_ref_UK = SN8332116494
| survey =
| survey_electronic_format =
| discovery =
| geology = Limestone
| entrance_count =
| difficulty = Fully vertical, Single Rope Technique needed
| hazards =
| access = Public
| translation =
| language =
| pronunciation =
}}Pwll Dwfn is a cave in South Wales. It is located above Dan yr Ogof and cavers can access it from the show cave's car park. The entrance is not gated. Pwll Dwfn is one of the few caves in the area which requires single rope technique (SRT). The pot itself consists of 5 pitches totaling 97m from top to bottom. The cave is terminated by two static sumps and has colonial coral fossils on the walls. Sources- {{cite web|url=http://www.cambriancavingcouncil.org.uk/pwll_dwfn_topo_guide.html |title=Pwll Dwfn topo guide |publisher=Cambrian Caving Council}}
{{coord|51.83483|-3.69480|format=dms|type:landmark_region:GB_source:enwiki-osgb36(SN8332116494)|display=title}}{{wales-geo-stub}}{{caving-stub}} 2 : Swansea Valley|Caves of Powys |