Olduvai Gorge: Why Its Real Name Is Oldupai

Olduvai Gorge in northern Tanzania is one of the most important places on Earth for understanding human origins, but its name is a mistake. The gorge takes its name from oldupai, the Maasai word for a wild sisal plant that grows thickly along its slopes. "Olduvai" is a European mishearing that found its way onto maps early in the twentieth century and then into textbooks, museums and the scientific literature. Tanzanian heritage authorities now promote the original form, Oldupai, and so does this expedition.

So the short answer to "what is it?" is this: a steep-sided ravine, roughly 48 km long and up to around 90 metres deep, cut through layers of volcanic ash and old lake sediments on the edge of the Serengeti plains. Those layers hold close to two million years of stone tools, animal bones and fossils of our early relatives, stacked in order like pages in a book.

Olduvai Gorge or Oldupai: how a plant became a misspelling

The plant in question is a tough, spiky wild sisal (today classified in the genus Dracaena, long known as Sansevieria). Maasai pastoralists, whose herds have grazed this country for generations, named the place after it. The usual account is that a German entomologist, Wilhelm Kattwinkel, who came across the gorge around 1911 while chasing butterflies, recorded the name as he heard it. "Olduvai" stuck, was copied by the expeditions that followed, and became the spelling the world learned.

It is a small error with a large lesson. Who writes the map decides how a place is known, and for most of the twentieth century the people writing about Oldupai were outsiders. Restoring the local name is not pedantry. It returns a little authority to the people whose word it was in the first place. Pronunciation still deserves care: the expedition's plan is to check with Maasai speakers how the name is said today rather than assume.

Reading the layers: how the gorge tells time

What makes Oldupai so valuable is geology. Over hundreds of thousands of years a lake basin here filled with sediment, while nearby volcanoes in the Ngorongoro highlands dropped ash across the landscape. Later, earth movements and a seasonal river cut down through the lot, exposing the sequence in the gorge walls.

Geologists divide these deposits into Beds I to IV, with younger layers above. Bed I, at the bottom, dates to around two million years ago. Because many ash layers contain minerals that can be dated by the decay of radioactive potassium into argon, researchers can put reliable ages on the tools and bones found between them. Oldupai was one of the first sites where this method transformed the study of human origins.

• Bed I and the lowest part of Bed II: simple stone tools, animal bones with cut marks, and fossils of more than one kind of early hominin living side by side.
• Bed II onwards: the appearance of carefully shaped hand axes, part of the Acheulean tradition.
• Younger beds: changing climates, shifting lake edges and new animal communities, recorded layer by layer.

Oldowan tools and the famous finds

The oldest tools here gave their name to a whole technology: the Oldowan. These are cobbles struck to produce sharp flakes and simple chopping edges. They look modest, but they show planning, the selection of good stone and the transport of materials across the landscape. Older Oldowan-style tools are now known from elsewhere in East Africa, yet the name still honours this gorge.

The best-known finds came from the work of Louis and Mary Leakey. In 1959 Mary Leakey found a robust skull nicknamed "Zinj", now classified as Paranthropus boisei, a heavy-jawed relative that was not our direct ancestor. In the early 1960s, fossils from the gorge were used to name Homo habilis, a smaller-toothed, larger-brained species proposed as an early member of our own genus. Exactly where Homo habilis sits, and which fossils belong in it, is still debated. That uncertainty is honest science, not a gap waiting for a single "missing link". Human evolution looks far more like a branching bush than a ladder.

More than the Leakeys: Tanzanian science at Oldupai

Popular histories often tell Oldupai as a family story. The Leakeys' contribution was enormous, but the gorge has never been the work of one family. Tanzanian field workers, excavators and site guides have been central to the research from its early decades, often without credit in the published accounts. Today Tanzanian archaeologists, palaeoanthropologists and geologists lead and co-lead projects at the gorge, and Tanzanian heritage staff manage the site and the museum on its rim, which tells the story to visitors from across the country and abroad.

Recent research has moved beyond hunting for spectacular skulls. Teams study how carcasses were butchered, which animals used the same lake margins, how vegetation changed, and how early people moved through a landscape shared with large predators. Much of this depends on patient survey, fine excavation and laboratory work that rarely makes headlines.

The Ngorongoro Conservation Area

Oldupai lies within the Ngorongoro Conservation Area, a UNESCO World Heritage site recognised for its wildlife and volcanic landscapes and, since 2010, also for its archaeological and palaeontological importance. You can read the listing on the UNESCO World Heritage Centre website. The area is also home to Maasai communities, and the balance between conservation, tourism and the lives of the people who live there is a live and contested question in Tanzania. Any honest account of the gorge should keep both in view: a scientific treasure and a lived-in landscape.

Why this matters on foot

Wandering Through Mankind is a walk about how people have moved, settled and named the world. Earlier on the route, South Africa raises the question of where humanity began, explored in our piece on the Cradle of Humankind, and Zambia adds the story of the Kabwe skull. Oldupai adds something different: tools, environments and change over a very long span of time.

Later in the walk, Leon's line enters Tanzania from Zambia and heads west towards Rwanda. Oldupai sits well to the north-east of that line, so the plan is for a research trip away from the road: Leon records the exact point where he stops walking, travels to the site, and returns to that same point to carry on. Transport never counts as walked distance. He hopes to learn from qualified guides and Tanzanian researchers, to pronounce the names properly, and to separate what is known from what is still argued over. You can follow that work in the journal once he is walking, read more about Leon, or back the walk.

Frequently asked questions

Why is Olduvai Gorge called Oldupai?

Oldupai is the Maasai name, taken from a wild sisal plant that grows in the gorge. "Olduvai" came from an early twentieth century European mishearing and spread through maps and scientific writing.

What was found at Olduvai Gorge?

Some of the oldest well-dated stone tools in the world (the Oldowan industry), later hand axes, huge numbers of animal fossils, and hominin fossils including Paranthropus boisei and the specimens used to name Homo habilis.

How old are the layers at Oldupai?

The lowest layers, Bed I, are around two million years old. The gorge itself was cut much more recently, which is what exposed the ancient layers.

Can you visit Olduvai Gorge?

Yes. It lies within the Ngorongoro Conservation Area, usually reached on the road between Ngorongoro and the Serengeti, and has a site museum and viewpoint. Entry fees and access rules are set by the conservation authority, so check current arrangements before travelling.