Although a few Early Stone Age and Middle Stone Age archaeological sites are recorded from ground surface finds in Tsavo, there is much evidence for thriving Late Stone Age economy from 6,000 to 1,300 years ago. Research has shown that Late Stone Age archaeological sites are found close to the Galana River in high numbers. The inhabitants of these sites hunted wild animals, fished and kept domesticated animals. Because of the sparse availability of water away from the Galana River, human settlement in Tsavo focused on the riparian areas and in rock shelters as one moves west.
Swahili merchants traded with the inhabitants of Tsavo for ivory, catskins, and probably slaves as early as 700 AD (and probably earlier). There is no evidence for direct Swahili "colonization" of Tsavo. Instead, trade was probably accomplished by moving goods to and from the Swahili Coast via extended kin-networks. Trade goods such as cowry shells and beads have been recovered from archaeological sites dating to the early Swahili period.
19th century British and German explorers document people we now refer to as Orma and Waata during their travels through the "nyika," and generally viewed them as hostile toward their interests. Beginning in the late 19th/early 20th century, the British began a concerted effort to colonise the interior of Kenya and built a railway through Tsavo in 1898. Legend has it that "man-eating lions" terrorized the construction crews, however modern scholarship attributes the Waata for kidnapping and killing Indian and British labourers in an attempt to stop the unwanted intrusion into their territory. Inevitably, the British colonial authority bolstered security for the construction effort and the railway was built.
Tsavo remained the homeland for Orma and Maasai pastoralists and Waata hunter-gatherers until 1948, when it was gazetted a national park. At that time, the indigenous populations were relocated to Voi and Mtito Andei as well as other
