This is a panoramic photo of the Claerwen dam in the Elan Valley, Wales UK. This is the largest of the dams in the Elan valley, that supply water to the city of Birmingham in England. It was opened by Queen Elizabeth II in October 1952. The Elan Valley is a great place to visit. I made a post about it here https://steemit.com/travel/@sharpshot/the-elan-valley-reservoirs-in-mid-wales-uk