Elsewhere there are other preparations needed for the coming year, for instance at Henrhyd waterfalls in the village of Coelbren. The falls, which are the largest single drop waterfalls in South Wales, are situated in the Nant Llech valley, this area is also designated as a S.S.S.I. The damp, heavily wooded gorge, with its thin soils and steep rocky slopes, is a haven for shade and damp-loving plants like mosses, liverworts and lichen. But the geology of this site does also make delivering materials to site somewhat tricky, so materials have to be carried down by hand. This includes scalpings which are used to surface the paths, stone for pitching and timber to replace bridges, gates, fences and steps; everything seems much heavier here!