Always a fan of explorations of lost rivers, this one is takes the existing urban pattern and erases the former route of the Fleet River in London (via the Londonist)

“As most readers will know (and we’ve seen first hand), the river is now entirely underground and used as a sewer, but you can still pick out its course in the sloping streets of its former banks and, occasionally, a telltale street name. Reader Simon Dovar is one of many to be intrigued by this vanished river, and has put together a map of its route:  ” I did a bit of research to trace the path of the lost River Fleet as it meanders under the streets of London. As you can see the map is completely hand drawn in pencil as well as the street indicators. The river is indicated by the rubbed out streets.”  Nice touch – a vanished watercourse marked out in erased pencil lead.”

:: image via  The Londonist