Photographic Print of A tumbling waterfall heading for Garreg Ddu reservoir in the Elan Valley. This lovely waterfall is on the roadside and easy of access, with space for four cars. It tumbles out of a steep woodland then passes under the road. From here it cascades into the reservoir. It is part of the Nant Dolfolau stream. The reason that this waterfall is so popular is its proximity to the road.