Chandler - good lengthy entry.

Wikipedia Count Teleki and his companion, Lieutenant Ludwig von Höhnel, an Austrian naval officer, left Pangani (Tanzania) in February 1887 with around 400 porters, following the Ruvu river. They were the first to survey a great part of the East African Rift. Teleki was the first to reach the snow-line on Mount Kilimanjaro at 5,300 m, and the first explorer to set foot on Mount Kenya, climbing up to around 4,300 m. He later headed on northwards, following the interior river system, to see on 5 March 1888 the last of the Great Lakes, referred to as the Jade Sea by Count Teleki, who named the lake after his friend, Prince Rudolf. The lake was renamed Turkana in 1975 from the tribe that inhabits its shores. Teleki's and von Höhnel's journey in southern Ethiopia also unveiled a smaller lake, Stefanie (named after Princess Stéphanie of Belgium, the prince's wife), now called Lake Chew Bahir. Though it is commonly stated that he discovered the body of water now referred to as Lake Turkana, the African people living around the lake certainly were aware of it. Even if the meaning of the word "discovery" is taken so as to put that aside, the existence of the lake was known in Europe decades prior to Teleki's expedition. As far back as 1849, Dr. Ludwig Krapf wrote about the Samburu people and his intentions of visiting their lands. A far more direct reference to the lake is found in an 1869 article in the Journal of the Royal Geographical Society. Here, the author, who himself relied on descriptions from African long distance traders, described a large water body. The article included a detailed map and here, the position, general shape and orientation are a perfect match for Lake Turkana.