This map depicts the west half of London in 1270. The River Fleet can be seen running west of the city wall until it eventually meets the Thames. Fleet Bridge, Fleet Prison, and Fleet Street are also depicted on the map.
The Fleet begins from two streams located on Hampstead Heath, one of which begins in the grounds of the Kenwood Estate. Both streams were dammed in the eighteenth century to create reservoirs. These reservoirs then run into underground sewers and…