Five Weeks in a Balloon the need to release gas or throw ballast overboard to control his altitude, allows very long trips to be taken. This voyage is meant to link together the voyages of Sir Richard Burton and John Hanning Speke in East Africa with those of Heinrich Barth in the regions of the Sahara and Chad. The trip begins in Zanzibar on the east coast, and passes across Lake Victoria, Lake Chad, Agadez, Timbuktu, Djenné and Ségou to St Louis in modern-day Senegal on the west coast. The book describes the unknown interior of Africa near modern-day Central African Republic as a desert,
John Hanning Speke his femur and exiting. Showing tremendous determination he used his bound fists to give his attacker a facial punch and this gave Speke an opportunity to escape, albeit he was followed by a group of Somalis and he had to dodge spears as he was running for his life. Rejoining Burton and Herne the trio eventually managed to escape with a boat passing along the coast. The expedition was a severe financial loss and Speke's natural history specimens from his earlier leg were used to make up for some of it. Speke handed Burton his diaries that Burton used as