Map of Sierra Leone and hinterland. British territory and slave trading localities are denoted by a red line and a green line beneath names, respectively. Slave factories are indicated, including those on the Scarcies, Sherboro, Shebar and Gallinas rivers, as well as the factory on the River Pongo owned by "Mrs Lightburn"., The map was produced to accompany Richard Robert Madden's anti-slavery report published in: Great Britain. Parliament. House of Commons. Select Committee on the West Coast of Africa. Report : together with the minutes of evidence, appendix, and index. 1842.