River Effra

A former south London tributary of the Thames, the [River Effra](https://www.londonmuseum.org.uk/collections/london-stories/lost-rivers-the-effra/) ran from Upper Norwood to Vauxhall and was absorbed into the sewer network in the mid-19th century. Its hidden course still shapes street patterns and flood risk across Lambeth.

Upper Norwood to Vauxhall, London, United Kingdom