The United Republic of Tanzania is a nation in East Africa. A region with a lengthy and diverse history, Tanzania came under Portugal's control in the 16th Century. Portugal was ousted by the Omani Sultans, who held the region until Germany conquered most of it in the 19th Century, calling it German East Africa. However, after World War I, Germany was forced to give up all of its colonies and the region was given to the British Empire. It remained a British colony (called Tanganyika, later Tanzania) until it achieved independence in 1961.
While nothing is specified beyond "East Africa," the context makes fairly clear that the reference is to the Olduvai Gorge, which in OTL is part of Tanzania. While that specific nation, or even a reasonable analog, may not necessarily exist in the Fleshtimeline, the reference is placed here for convenience.