Reginald Ernest Moreau, George Henry Evans Hopkins and Robert William Hayman in 1945/46 restricted the type locality at Mianzini to a few miles east-southeast of Lake Naivasha, on the southern end of the Kinangop Plateau and to an elevation of 9000 ft (2743 m).
The tourist owned a small plane and took Gachamba out for a short trip around Lake Naivasha.
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Apart from the Rift Valley itself, the area has other important geographic features such as: the extinct volcanoes Mount Longonot and Mount Suswa and Lake Baringo, Lake Bogoria, Lake Magadi, Lake Nakuru, Lake Naivasha, the Suguta Valley, and Lake Turkana.