Lost or historical waterway
Fleet
One of London’s best-known lost rivers. Some headwaters remain visible, but the historic urban route is largely buried or absorbed into drainage.
Hampstead / Highgate to Blackfriars
First met in
Selected book connection: Rivers of London. This is a selective index, not a verified first appearance.
Related and sources
Explore on the river map → · Geographical reference ↗
Fictional relationships and real geography are recorded separately. The map explains the limits of its waterway data.
Later in the series · possible spoilers
Fleet. The river and its personification share a name. The dotted line does not imply a walkable underground route.