Aruwimi-Uele was split into two districts: Uele (Niangara) and Aruwimi (Basoko).
North of Équateur the Bangalas District stretched along the northwestern section of the Congo River, and the Ubangi District defined the northeastern border of the colony with the French colonies, which lay across the Ubangi River.
[5] Further east the Uellé District covered the basin of the Uele River, the main tributary of the Ubangi, and extended along the north of the colony to the Lado Enclave on the Nile, leased from Britain.
The remainder of the colony was covered by the huge Stanley Falls District, stretching south along the Congo into Katanga, bordered by the British and German possessions to the east of Lake Tanganyika and Lake Albert.
[5] On 15 July 1898 the Stanley Falls District officially became the Orientale Province, with Stanleyville as its headquarters.