Ogof Ffynnon Ddu , 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.
OFD was discovered in 1946 through digging by Peter Harvey and Ian Nixon, members of the newly formed South Wales Caving Club. Exploration beyond the Boulder Chamber in 1957 revealed passages as far as the Dip Sump. Major extensions were discovered in 1967 through to Cwm Dŵr, which is now known as OFD2. The system is famous for its intricate maze-like structure and its impressive main stream passage.
Source: Wikipedia.org
Copyright: Creative Commons 3.0
| | Public | German
Address: Powys, United Kingdom
Statistics
Select one of the most popular activities below or refine your search.
Discover the most beautiful and popular trails in the area, carefully bundled into appropriate selections.
Select one of the most popular categories below or be inspired by our selections.
Discover the most beautiful and popular attractions in the area, carefully bundled in appropriate selections.
With RouteYou, it's easy to create your own customised maps. Simply plot your route, add waypoints or nodes, add places of interest and places to eat and drink, and then easily share it with your family and friends.
Route planner
<iframe src="https://plugin.routeyou.com/poiviewer/free/?language=en&params.poi.id=1512544" width="100%" height="600" frameborder="0" allowfullscreen></iframe>
More than 10,100,000 routes
More than 15,000,000 users
More than 4,500,000 points of interest
Kerkstraat 108
9050 Gentbrugge, Belgium
© 2006-2026 RouteYou - www.routeyou.com
