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 he found hard and time consuming as he was not naturally a gifted writer. He failed to give a good and full report to the RGS for many months and thus in effect was not defending his positions of discovery. In addition Speke had a public dispute with the Pethericks who had by and large acted according to their RGS instructions but Speke had felt they had not. All this led Roderick Murchison, president of the Royal Geographical Society, to start disliking Speke and a third expedition, led by Speke, was becoming less likely as it would have to be