Located in Tanzania, near the border of Kenya, Mount Kilimanjaro is one of the Earth's most famous mountains, certainly the most famous African mountain. It is the tallest mountain in the African continent, and the tallest free-standing mountain in the world, at approximately 5,895 meters (19,341 feet), although it is actually a strato-volcanic. Its name translates roughly from Swahili into "White Hill."
During the final hours of the Forerunner-Flood war, the Librarian oversaw the construction, activation, and burial of the nearby Ark portal. After destroying her Keyships, she spent her last days near the mountain. She described Kilimanjaro as "a beautiful thing - a snowcapped sentinel".
In the 24th century, melted water from Kilimanjaro was collected by the Global Water Campaign's water purification complexes, processed and sent along the GWC Trans-African Pipelines along the Tsavo Highway for use across the rest of the African continent. By the 26th Century this facility has fallen into disrepair and is overgrown in jungle after more than a century of neglect. One of GWC's installations, the A2 Hydroelectric Facility located along the Nkuu River, was still operational by the 26th century.
 Battle of Earth
- Main article: Raid on Kilimanjaro
On November 17, 2552, John-117 crashed to Earth close to Kilimanjaro, with UNSC Marines assisting the Spartan in evading Covenant occupiers and clearing much of the jungle near Kilimanjaro of the Covenant presence before being extracted.
- The level Sierra 117 of Halo 3 is set in the jungles near Mount Kilimanjaro.
- If a player gets 7 (five in Halo: Combat Evolved) kills within 4 seconds of each other, they get the medal Killimanjaro. The medal has existed since Halo: Combat Evolved, but few have legitimately earned it in regular multiplayer - it is considerably easier to get in Firefight. In similar vein, Halo: Reach also introduced Skullamanjaro, a legendary Headhunter medal obtained by winning a game by returning 10 skulls at once.