Caroline Noble delves underground to discover what happened to the River Effra and stumbles across a campaign to restore it
http://livingsouth.greatbritishlife.co.uk/article/a-river-runs-through-it-effra-thames-tributaries-16895/
The River Effra was once a large tributary to The Thames and was already being used as a sewer by the 17th century, although the upper reaches were still clear in the second half of the 19th. The name is derived from the Celtic word for torrent (e.g. 'ffrydlif' in current Welsh) given by the pre-Roman tribes (see Peter Akroyd's 'The Thames').
http://shadyoldlady.com/location.php?loc=1447
Time Out traces the route of south London's lost river Effra – with the aid of an artist, a dowsing rod and a few leaps of faith
http://www.timeout.com/london/features/7017/Spring_walks_in_London-river_Effra.html
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