Olduvai Gorge (officially Oldupai Gorge) is a ravine in Tanzania's Ngorongoro Conservation Area, on the road between Ngorongoro Crater and the Serengeti, and one of the most important places in the world for understanding human evolution. Fossils and stone tools found here by Louis and Mary Leakey, including the 1959 "Nutcracker Man" skull and the first Homo habilis fossils, cover close to two million years of our ancestors' story. A visit takes 1–2 hours: a guided talk at the viewpoint, the museum with its replica of the Laetoli footprints, and, nearby, the moving black dune known as the Shifting Sands. It fits easily into a drive to or from the Serengeti.
Olduvai Gorge at a glance
| Location | Ngorongoro Conservation Area, northern Tanzania, between Ngorongoro Crater and the Serengeti |
|---|---|
| Size | A steep-sided ravine roughly 48 km long and up to about 90 m deep |
| Known as | One of the "cradles of humankind" |
| Protected status | Part of the Ngorongoro Conservation Area World Heritage Site, listed by UNESCO for both nature and archaeology |
| Managed by | Ngorongoro Conservation Area Authority |
| Time needed | 1–2 hours (museum and viewpoint) |
| Best combined with | Ngorongoro Crater, the southern and central Serengeti, the Shifting Sands |
Olduvai or Oldupai? The name explained
The gorge takes its name from the Maasai word oldupai, for the wild sisal plant that grows across the area. Early European visitors recorded it as "Olduvai", and that spelling stuck in the scientific literature and in guidebooks. Tanzania now officially uses Oldupai Gorge, which is what you will see on signs at the site. Both names refer to the same place.
Why Olduvai matters
Around two million years ago, this was the shore of a lake surrounded by grassland and woodland, with volcanoes nearby. Animals and early humans came to the water, and volcanic ash and lake sediments buried their bones and the stone tools they used, layer upon layer. Later, a river cut down through those layers, creating the gorge and exposing a deep, well-dated record of the past. Scientists divide it into a series of "beds", each representing a different chapter of time.
That rare combination of fossils, tools and datable volcanic layers is why Olduvai is so important. The oldest widespread stone-tool tradition in the world, the Oldowan, is named after the gorge.
The key discoveries
- Early exploration: fossils were reported here in the early 20th century by German scientists, and the British-Kenyan archaeologist Louis Leakey began working at Olduvai in 1931.
- "Nutcracker Man" (1959): Mary Leakey found a robust skull with huge teeth, first named Zinjanthropus boisei and now classified as Paranthropus boisei. Dated to about 1.75 million years ago, it made headlines worldwide and transformed the search for human origins in East Africa.
- Homo habilis (1960s): further fossils from Olduvai led the Leakeys and colleagues to name a new species, Homo habilis, "handy man", linked to the stone tools found at the site.
- Decades of research: Mary Leakey led excavations at Olduvai for many years, and research by international and Tanzanian teams continues today.
The Laetoli footprints
Around 45 km south of Olduvai, at Laetoli, Mary Leakey's team discovered in 1978 a trail of footprints left in volcanic ash about 3.6 million years ago by early hominins walking upright. They are among the oldest direct evidence of bipedal walking ever found. The original site is protected and not open to visitors, but the Olduvai museum displays a cast, and it is one of the highlights of the visit.
What a visit looks like
- The viewpoint and talk: a guide gives a short talk overlooking the gorge, explaining the layers, the discoveries and where key finds were made. From here you can see the striking rock formation in the middle of the gorge that guides use to explain the different beds.
- The museum: displays of fossils, stone tools, the Laetoli footprint cast and the story of the excavations. The original small museum was set up in the time of Mary Leakey, and a newer museum building has since been added.
- Optional extras: some guides can arrange a walk down into the gorge, and some visitors combine the stop with a visit to a nearby Maasai community.
There is a shaded area and toilets, and many visitors have a picnic lunch here on the drive between the Crater and the Serengeti.
The Shifting Sands
A short drive north of the gorge, the Shifting Sands is a crescent-shaped dune of black volcanic ash, believed to have come from the nearby volcano Ol Doinyo Lengai. Pushed by the prevailing wind, it creeps slowly across the plain, about 15–17 metres a year according to commonly quoted figures, and markers show where it has been in past years. It is held to be sacred by local Maasai, so climbing on it is discouraged. The track is rough, so go with a driver-guide who knows the area. Ol Doinyo Lengai itself is covered in our Lake Natron guide.
Getting there and fees
Olduvai lies a short detour off the main road from Ngorongoro Crater to the Serengeti, roughly an hour's drive from the crater rim. Because it is inside the Ngorongoro Conservation Area, you pay the conservation area fees that already apply to your crater visit, plus a separate museum and site entry fee. Your safari operator usually includes these. For a breakdown of Ngorongoro's fees, see our Ngorongoro Crater guide and Tanzania safari cost guide.
Fitting Olduvai into your safari
Olduvai fits most naturally into the transfer day between the Crater and the Serengeti:
- Crater to the Serengeti: morning game drive in the crater or an early departure from the rim, Olduvai for late morning and lunch, then on to the Serengeti for an afternoon game drive.
- Migration season (about December to March): when the herds are in the southern Serengeti and Ndutu area, Olduvai sits right on the way.
- Add culture: combine with a visit to Lake Eyasi and the Hadzabe or a Maasai cultural visit for a deeper look at people and place.
Classic northern-circuit routes are in our Tanzania safari packages and the classic Serengeti and Ngorongoro safari. For where the herds are each month, see the Great Migration by month.
Is Olduvai Gorge worth visiting?
Yes, for most travellers, because it costs only an hour or two on a day you are driving anyway, and it adds a dimension most safaris lack: standing where our early ancestors lived, with the same plains and wildlife around you. It is especially rewarding for families with curious children, students and anyone interested in science or history.
Skip it if you are flying between the Crater and the Serengeti and would need a long detour, or if every minute of your trip is reserved for wildlife. Even then, consider the museum's Laetoli cast: it is a remarkable thing to see in person.
Planning the wider area? Start with the Ngorongoro destination page, the Serengeti guide and our Tanzania national parks guide.