General Information about Caving on Mynydd Llangatwg

The purpose of these pages is to provide up-to-date information about caving on Mynydd Llangatwg (Llangattock Mountain) and in the Clydach Gorge
This information was last updated on 01/05/17.

Latest News

The handline from Lower Main Stream into High Traverse Biza has been renewed. Recently the Biza Passage handlines were also replaced.

The padlock on Agen Allwedd gate has been replaced due to an object having being jammed in it. It has been noticed that a few keys do not seem to work in the replacement lock as well as others, but it seems the problem is not as widespread as first feared. If your key does not work reliably, make sure you push it into the lock firmly as you turn it. Let us know if you do experience any difficulties opening the lock, and we can get your key replaced if necessary.

Road construction work is underway in the Clydach Gorge and is due to continue until 2018. We have been advised that there will be two specific periods during 2017 when access will not be permitted to certain caves due to drilling and excavation work in the vicinity. During the spring and early summer Ogof Nant Rhin and Ogof Pont Gam will be closed; during summer and autumn Ogof Capel and Ogof Gelynnen will be closed.

The next meeting of MLCMAC will be held at the NRW office in Abergavenny on Friday 19th May 2017 at 8 p.m. Observers are welcome to attend.

The lifeline and safety lines at the main ladder pitch have been renewed, and some of the bolts have also been replaced as necessary. The hauling line has also been re-rigged.

Fixed aids which are adopted by MLCMAC and periodically inspected are now labelled with round metal tags marked "MLCMAC". You are reminded that the security of fixed aids in caves cannot be guaranteed. You use them at your own risk and should always inspect them carefully before use.

Although there have been no recent rockfalls from the cliff above Ogof Craig a Ffynnon the area cannot be considered stable. It is inevitable that further rock falls will occur from time to time in the future as they have done periodically over the last 4 decades especially after a thaw following freezing winter conditions. Permits are being issued, but parties visiting the cave should be vigilant to the possibility of falling rocks from anywhere along this section of cliff, and not remain in the area of the cave entrance longer than necessary.

The padlock on the entrance gate has been replaced after several parties reported problems opening it. If the key does not turn easily, please do not force it as the key has probably not engaged properly with the lock mechanism.

Two handlines marked BCA-G and BGA-H have been installed in Llangattock caves as part of the BCA rope testing programme. Please do not remove or substantially alter the rigging of these ropes. One is in in Antler Passage in Daren Cilau, the other is on the climb before 2nd BC in Craig-a-Ffynnon.

Permanent loan keys are available from CSS to bona-fide caving clubs on payment of a 10 pound deposit. Contact Adrian Fawcett (see contact details below).

Access to this cave is managed by Cambrian Caving Council. To limit further damage to formations, all trips must be led by a designated leader for the cave and party sizes are limited to leader + 2. A list of leaders can be found on the Cambrian Caving Council website.

Agen Allwedd gate can be opened from the inside when padlocked on the outside. Therefore the padlock should always be re-fastened as soon as the gate has been opened.
Craig-a-Ffynnon gate padlock is attached to the gate via a special metal bar. Please make sure the last person into and out of the cave knows how to re-fit the bar and lock.


Caves under Llangattock Mountain and in the Clydach Gorge come within the remit of the Mynydd Llangatwg Cave Management and Advisory Committee (MLCMAC). Wardens for the main caves are appointed every two years. MLCMAC works closely with Natural Resources Wales (formerly Countryside Council for Wales), and liaises with the local landowner, Brecon Beacons National Park, and other local bodies. Also it tries to keep the peace in the relationship between cavers and local residents.
Caving trips are monitored via the cave log books and 'caver counters' which are installed in certain caves.
The secretary of MLCMAC is currently Adrian Fawcett
AF's email address

Craig-y-Cilau Nature Reserve

The entrances to Agen Allwedd and Eglwys Faen are located within the Craig-y-Cilau Nature reserve.


In Agen Allwedd and Craig A Ffynnon, the use of carbide is explicitly forbidden. In the other caves it is strongly recommended that carbide is not used, and all spent carbide must leave the cave as it is a pollutant and is unsightly. Bats are present in most of the Llangattock caves and are adversely affected by the fumes. Your cooperation is appreciated.

Car Parking

Visitors should be aware that break-ins have occurred all too frequently to cars parked in the Daren car park and by the cattle grid on the Llangattock - Beaufort road. Parking space outside Whitewalls is limited, and access along the private road must not be blocked. At weekends in particular, please do not park at Whitewalls unless you are going to get changed inside, or have other business there.

Chelsea Spelaeological Society

CSS is the caving club who owns Whitewalls. Other caving groups may book accommodation here. For contact information, please see their web page.