How did Henry Morton Stanley help confirm the source of the Nile River?

Henry Morton Stanley played a significant role in clarifying the geography of the Nile River through his extensive expeditions in central Africa.

During his 1874–1877 expedition, Stanley circumnavigated Lake Victoria, which confirmed the earlier estimates made by John Hanning Speke regarding the lake's size and importance to the Nile system. Additionally, he explored Lake Tanganyika and determined that it had no connection to the Nile, effectively narrowing the scope of the river's potential sources.12

Stanley’s final contribution to resolving the geography of the Nile occurred during his 1889 expedition to relieve Mehmed Emin Pasha. While traveling through the region, he identified the Ruwenzori Range and demonstrated that the Semliki River linked Lake Edward and Lake Albert. By clearing up these remaining geographic uncertainties, Stanley helped finalize the understanding of the Nile's sources.12