Rutland Water (Scan from 1990)

A biological Site of Special Scientific Interest, a Special Protection Area under the European Union Directive on the Conservation of Wild Birds.

“Rutland Water is a reservoir in Rutland, England, east of the county town, Oakham. It is filled by pumping from the River Nene and River Welland and provides water to the East Midlands. It is one of the largest artificial lakes in Europe. By surface area it is the largest reservoir in England, but by capacity it is exceeded by Kielder Water.”
en.wikipedia.org/wiki/Rutland_Water