. Pistyll Rhaeadr landscape 0 Pistyll Rhaeadr is a rather stunning location in Wales and is the largest waterfall in the country falling some 000 ft in a series of drops, the largest of which is around 000 ft. The walk to the top is 'interesting'. Pistyll Rhaeadr landscape 0 Pistyll Rhaeadr is a rather stunning location in Wales and is the largest waterfall in the country falling some 000 ft in a series of drops, the largest of which is around 000 ft. The walk to the top is 'interesting'. Pistyll Rhaeadr landscape 0 Pistyll Rhaeadr is a rather stunning location in Wales and is the largest waterfall in the country falling some 000 ft in a series of drops, the largest of which is around 000 ft. The walk to the top is 'interesting'. 