Deri is a steep wall of compact rock, tucked away in the hills above the town of the same name. It is not too far from Bargoed Quarry and a visit to both on the same day could be easily combined, if finger strength is not depleted! The main attraction at Deri is the steep wall of grade 7s which, once clean, gives some excellent sustained pitches. The crag has been de-bolted in the past, but most of the routes have been restored. It can be dirty, but once back in regular use should remain clean.
The crag is located between Deri and Bargoed and is quite awkward to get to. Either drive towards Deri from Bargoed, until the crag can be seen up on the left, park and walk in, or take a shorter but easy-to-get-lost way in. This involves taking the left fork just before Bargoed high street starts to drop down and taking a steep road to a right turn immediately before Heolddy Comprehensive School. Go over the first cattle grid to a second, then turn right. Follow this road for about a mile, until a grassed-over spoil heap can be seen on the right about 200m before a small stream valley with a marked footpath. Park, go over the fence and follow the path leftwards contouring round the hill to arrive at the crag. If on foot, forget it.