The Elan Valley Reservoirs are a series of man-made lakes located in the picturesque Elan Valley in Wales. Constructed in the late 19th and early 20th centuries, these reservoirs were built to supply water to the city of Birmingham. The area is known for its stunning landscapes, featuring rolling hills and lush greenery. The reservoirs include Craig Goch, Garreg Ddu, Plynlimon, and Caban Coch. Together, they form a vital part of the region's water supply system. The Elan Valley is also a popular destination for outdoor activities, such as hiking and birdwatching, attracting visitors who appreciate its natural beauty.