The reservoir is Severn Trent Water's largest. When full, it can take as much as up to 59.666 gigalitres (1.3125×1010 imp gal), and it covers an area of 4.53 square kilometres (1,120 acres) of land, the equivalent of around 600 football pitches. The lake has a circumference of 11 miles (18 km) with a road that goes all the way around it. Its length is 4.75 miles (7.64 km).
The lake supplis the city of Liverpool with fresh water. Interestingly it is the water source used in the manufacture of Bombay Sapphire gin - very nice with ice lemon and tonic water! :)