Bastion Highwalk, London, EC2. Photo ©RogerDean 2014
Dickens’s Dictionary Of London, An Unconventional Handbook – Charles Dickens, 1882:
Hyde Park – [...] A large piece of ornamental water, called by the authorities the Serpentine where it traverses the park, and the Long Water so far as concerns the portion in Kensington-gdns, runs in a sort of irregular quadrant from N. by way of S.W. to E., and is commonly known as the Serpentine throughout. It is a favourite place for skating, and about the most dangerous in London.