London River fact...
"· Neckinger: rising in Southwark, the Neckinger joins the Thames via St Saviour’s Dock, where pirates were hanged in the 17th century. The river’s name may derive from the term ‘devil’s neckcloth’ (i.e. the noose). In the 19th century, the mouth of the Neckinger was known as Jacob’s Island, a place of great poverty and squalor, described as the very capital of cholera and the Venice of drains. Charles Dickens lets one of his best-known characters, Bill Sykes (from Oliver Twist) meet a violent death in the mud of the Dock."
London's lost rivers