Hidden in the mid-Wales countryside lies one of Wales' most treasured landmarks, a chain of dams and reservoirs set against a backdrop one of the country's most picturesque beauty spots.
Originally built 100 years ago to supply clean water to Birmingham, the six dams of the Elan Valley in Powys have attracted visitors from all over the UK for their wildlife, geology, history and spectacular scenery.
But recent visitors have been left puzzled as to why water levels in Craig Goch and Pen y Garreg appear dramatically low.
