The Queen Caroline Memorial is a stone urn mounted on a plinth overlooking the east end of the Serpentine.
This memorial is to Queen Caroline, the wife of King George II, who from 1726-1730 created the Serpentine in Hyde Park and the Long Water in Kensington Gardens. The lake follows the shape of the valley of the Westbourne Stream, which now flows underground.
The Queen Caroline Memorial was unveiled by HM The Queen in 1990.
Interesting fact: Before creation of The Serpentine, there were six natural ponds in Hyde Park.