Originally Posted by jayeff

A lot of people don't realize that more than a dozen old rivers still run under London, alongside or part of the sewer system. Names like Westbourne, Ravensbourne, Peck, and Stamford Brook are reminders, as is Fleet Street, named after the biggest of these rivers, that was up to 200 yards wide in Roman times. Another, the Effra, was used by Vikings to attack London a thousand years ago, but today flows underground from Crystal Palace and empties into the Thames near Kennington....