Brecon Beacons
Penwyllt
Entrances to
Ogof Ffynnon Ddu
The cave system extends
to about 40 miles of
passages
Wales
Neath
Swansea
5 km
5 miles
Brecon Beacons
Penwyllt
Entrances to
Ogof Ffynnon Ddu
The cave system extends
to about 40 miles of
passages
Merthyr Tydfil
Wales
Neath
Swansea
5 km
5 miles