The Rwenzori Mountains rise on Uganda’s western border with the Democratic Republic of Congo, their glaciated peaks—the highest in sub-Saharan Africa outside of Kilimanjaro and Kenya—permanently wreathed in cloud. For centuries, these mountains were known to the outside world only as the “Mountains of the Moon”: a legendary source of the Nile mentioned by the Greek geographer Ptolemy in the second century AD, believed by some geographers to be mythical, and not identified by European explorers until the late nineteenth century. Their story is one of the most compelling geographical mysteries in African exploration history, and it connects directly to Uganda’s place in the colonial imagination that shaped the country gorilla trekkers visit today.
Ptolemy’s Mountains of the Moon
Claudius Ptolemy’s Geography, written around 150 AD, described the Nile as rising from a great lake fed by snowmelt from mountains he called the “Lunae Montes”—the Mountains of the Moon. This description was based on information from traders and merchants who had travelled into the African interior from the East African coast, and it was remarkably accurate for a second-century geography: the Nile does rise from Lake Victoria, fed in part by rivers descending from snowcapped mountains in the western Rift Valley. Ptolemy’s accuracy was recognised only when the mountains were finally confirmed by European survey in the 1880s and 1890s.
For the intervening seventeen centuries, the Mountains of the Moon occupied an ambiguous space in geographical and imaginative literature: real enough to appear on maps, mysterious enough to serve as a repository for speculation about the interior of Africa’s geography. The difficulty of African exploration—disease, the challenges of overland travel, and the lack of European knowledge of the continent’s river systems—meant that the Rwenzoris remained unexplored from outside for almost two millennia after Ptolemy described them.
Stanley’s confirmation in 1888
Henry Morton Stanley, returning from his relief expedition to Emin Pasha (a besieged governor in the southern Sudan), became the first European to confirm and describe the Rwenzori Mountains in May 1888. Stanley had travelled to the region repeatedly in previous expeditions without seeing the mountains, which are typically obscured by their own cloud cap for most of the year. On a rare clear day from the shore of Lake Albert, he saw the snow-capped peaks and reported them as the likely Mountains of the Moon. The Italian explorer Luigi Amedeo, Duke of the Abruzzi, led the first major mountaineering expedition to the Rwenzoris in 1906, reaching the highest peak (now named Margherita at 5,109 metres) and providing the first comprehensive geographical survey of the range.
The Rwenzoris and the Bwindi connection
The Rwenzori Mountains and Bwindi Impenetrable National Park are both components of the Albertine Rift ecosystem—the western arm of the East African Rift Valley that runs from Uganda through Rwanda, Burundi, and eastern DRC. Both are recognised as globally significant biodiversity hotspots, and both are UNESCO World Heritage Sites. The exploration history that began with Stanley’s Rwenzori confirmation in 1888 ultimately led to the colonial maps, administrative structures, and national park designations that created Bwindi as a protected area. Gorilla trekkers who include the Rwenzoris in their Uganda itinerary—combining a Bwindi gorilla permit with a Rwenzori trekking permit—experience both dimensions of this extraordinary landscape within a single trip.
