Region, central Africa.
It was located north of Lake Albert on the west bank of the Upper Nile River , in what is now northern Uganda and southeastern Sudan. It was first explored by Europeans in 184142 and became a station for ivory and slave traders. Britain claimed the Upper Nile region in 1894 and leased to Leopold II of Belgium the area known as the Lado Enclave. It was incorporated into the Anglo-Egyptian Sudan in 1910.