Nile (TV series) their mission Speke separated from the main party and discovered Lake Victoria. The vast lake retains water like a vast reservoir with evaporations drained back by surrounding mountains. Speke returned with James Grant a year later and discovered the outlet at Ripon Falls. The new moon rains trigger the emergence of vast breeding swarms of flies that plagued the expedition. Speke and Grant headed downstream from the outlet but were forced to take refuge at Gondokoro. Here they met with Samuel Baker and his wife who had travelled up stream in search of the source and discovered Lake Albert in
John Hanning Speke Grant reached Gondokoro in Southern Sudan, where he met Samuel Baker and his "wife". (Her name was Florence von Sass and she had been rescued by Baker from a slave market in Vidin during a hunting trip in Bulgaria.) Speke had expected to meet John Petherick and his wife Katherine at Gondokoro, as they had been sent by the RGS south along the Nile to meet Speke and Grant. However the Pethericks were not there but on a side expedition to trade ivory, as they had run out of funds for their expedition. This caused some hard feelings between Pethrick