In 1857 two British officers set out from Zanzibar to find the Great Lakes rumoured to lie in the centre of the continent and, they hoped, the source of the Nile. They found two lakes, and then fell out over what they had found.
The route runs from a failed Somali expedition through Zanzibar, Kazeh and Ujiji to Lake Victoria, then on to Speke's Ripon Falls and the Bath debate that never happened. All pins are approximate, as the sources name regions and towns rather than exact spots.
In 1977 Robyn Davidson, then in her twenties, walked about 2,700 kilometres from Alice Springs to the Indian Ocean with four camels and her dog, crossing some of the emptiest desert on earth. She had spent two years in Alice Springs learning to train wild camels. She had no plan to write about it, but a National Geographic article and photographs by Rick Smolan made her famous, and her 1980 book Tracks became a classic, filmed in 2013.
The route follows her line west across the Northern Territory and Western Australia in order. Much of it crosses Aboriginal land, where she travelled with a Pitjantjatjara elder, Mr Eddie; pins mark communities and stations, not sacred sites.
