Explore Secret Stories South London\'s Lost River Tour, a self-guided interactive walking tour to enjoy whenever you want. Follow the ghostly trail of the Effra — south London\'s lost river. Discover how this local landmark disappeared under the ground 150 years ago. And learn what links it to rampaging Vikings, a runaway coffin, and Victorian sewer hunters. On this tour, you\'ll uncover the truth behind the legends. Is it true that Queen Elizabeth took her barge up the Effra to visit Sir Walter Raleigh? And did King Canute really sail up Brixton Hill in his bid to capture Saxon London? Total length: 3.91 miles; Suggested age range: 7+ Purchase this Tour (and more) in the Secret Stories App, available for free download from Android Play and Apple App store. You\'ll find more details of the tour and what it contains in the app!