Mehmed Emin Pasha was an Ottoman physician of German Jewish origin, naturalist, and governor of the Egyptian province of Equatoria on the upper Nile. The Ottoman Empire conferred the title "Pasha" on him in 1886, and thereafter he was referred to as "Emin Pasha".

Equatoria is the southernmost region of South Sudan, along the upper reaches of the White Nile and the border between South Sudan and Uganda. Juba, the national capital and the largest city in South Sudan, is located in Equatoria. Originally a province of Anglo-Egyptian Sudan, it also contained most of northern parts of present-day Uganda, including Lake Albert and West Nile. It was an idealistic effort to create a model state in the interior of Africa that never consisted of more than a handful of adventurers and soldiers in isolated outposts.