 Between 1875 and 1876 Stanley succeeded in the first part of his objective, establishing that Lake Victoria had only a single outlet – the one discovered by John Hanning Speke on 21 July 1862 and named Ripon Falls.If this was not the Nile's source, then the separate massive northward flowing river called by Livingstone, the Lualaba, and mapped by him in its upper reaches, might flow on north to connect with the Nile via Lake Albert and thus be the primary source.It was therefore essential that Stanley should trace the course of the Lualaba downstream (northward) from Nyangwe, the point where Livingstone had left it in July 1871.