Gobero: Prehistoric Cemetery of the Green Sahara in Niger

Gobero is a prehistoric lakeside cemetery and settlement in the Ténéré Desert of Niger, used by two different peoples between roughly 7700 and 2500 BC, when the Sahara was green. Discovered in 2000 and published in 2008, its roughly 200 graves make it the largest known Stone Age cemetery in the Sahara. It shows how people moved in and out of the desert as the climate swung between wet and dry.

Discovery and setting

Gobero was found by chance. In 2000 a team led by the University of Chicago palaeontologist Paul Sereno was exploring the Ténéré, a sand desert in central Niger, in search of dinosaur fossils. The expedition photographer Mike Hettwer noticed human bones, pottery and stone tools exposed on low dunes.

The dunes turned out to lie along the shore of a former lake, now called Palaeolake Gobero. Sereno returned with an international team of archaeologists, including Elena Garcea, and excavated the site in 2005 and 2006. The results were published in the journal PLoS ONE in August 2008.

During the African Humid Period, monsoon rains reached far north of their present limit. Shallow lakes formed between the dunes of the Ténéré, surrounded by grassland and scattered trees.

Bones from Gobero show what lived in and around the water: large Nile perch, catfish, turtles, crocodiles and hippopotamuses, as well as antelopes and other grassland animals. Lake sediments and pollen record the rise and fall of the water over thousands of years.

Two peoples, one place

Radiocarbon dates showed that Gobero was used in two separate phases by two different cultures, with a gap between them.

The first were the Kiffian, who lived at the lake from about 7700 to 6200 BC. Their skeletons show tall, robust people. They fished with bone harpoons and hooks, hunted, gathered wild plants and made pottery decorated with wavy lines and dotted wavy lines, a style found at many early Holocene sites across the southern Sahara. Their dead were usually buried tightly flexed, with the knees drawn up.

Around 6200 BC the climate became drier for several centuries, the lake shrank and the Kiffian disappeared from the record at Gobero.

When wetter conditions returned, a second people, the Tenerian, settled at the lake from about 5200 to 2500 BC. They were more slightly built than the Kiffian and are thought to have come from elsewhere. They hunted and fished but also kept cattle, part of the spread of cattle herding across North Africa. Their graves are more varied, with some bodies buried with ornaments, pottery or animal remains.

Researchers concluded that the Tenerian were a different population from the Kiffian rather than their direct descendants, though how the two groups were related is still studied.

The burials

The team recorded about 200 graves. Many skeletons were well preserved because they had been buried in sand near the water. Together they provide a rare picture of the health, diet and burial customs of Saharan communities over 5,000 years.

The most famous grave is a Tenerian triple burial dated to about 5,300 years ago (around 3300 BC). An adult woman and two children were laid on their sides facing each other, their arms reaching out and linked. Pollen found under them was interpreted as possible evidence of flowers placed in the grave, although pollen can also come from the surrounding soil.

Other burials include individuals with personal ornaments such as beads and bracelets. None of the graves explains how the people died, and the embracing burial should not be read as evidence of any particular event.

How the site was studied

Gobero was excavated as a whole landscape rather than as a single trench. The team mapped graves, hearths, pottery scatters and animal bones across the dunes, and studied sediment layers from the old lake bed to reconstruct how deep and how large the water was at different times.

Dating relied on dozens of radiocarbon measurements from human bone, animal remains, charcoal and shells. These dates are what revealed the two separate occupations and the dry gap between them. Pollen from the sediments showed how vegetation around the lake changed, from grassland and trees during wet phases to sparser plant cover as the climate dried.

Specialists also examined the skeletons for stature, robusticity, injuries and dental health, and used chemical analysis of teeth and bones to look at diet and at whether individuals had grown up locally. The project brought together palaeontologists, archaeologists, geologists, botanists and physical anthropologists from several countries.

Gobero in the wider Sahara

The names Kiffian and Tenerian were not invented at Gobero. Both had been used earlier by archaeologists for stone tools and pottery found at scattered surface sites in Niger and the southern Sahara, but these were rarely linked to well-dated skeletons. Gobero gave both cultures a much clearer place in time and showed what their people looked like.

The Kiffian, with bone harpoons and wavy-line pottery, belong to a broad band of early Holocene fishing communities that stretched from the Nile to the Niger. The Tenerian, with their cattle, are part of the later pastoral world also seen in the herders’ sites of the Egyptian desert, such as Nabta Playa, and in the cattle scenes of Saharan rock art.

A common misconception describes Gobero as a “lost civilisation” or a single tragic event. In fact it was a place used again and again over thousands of years by ordinary communities of fishers, hunters and herders. The graves accumulated over many generations, and there is no evidence of a single catastrophe.

Why Gobero was abandoned

The people of Gobero depended on the lake. Each time the monsoon weakened, the water receded and the site was abandoned. The final drying came in the third millennium BC, as the Green Sahara gave way to desert across the region.

This pattern matches evidence from other parts of the Sahara. In Egypt’s Western Desert, for example, people moved towards the Nile Valley and highland refuges as conditions dried.

Significance and debates

Gobero is important because it combines a large cemetery with settlement remains, animal bones and lake records at one place. It lets scientists link human populations directly to climate change.

Some conclusions remain open. Estimates of body size, population origins and the exact length of the dry gap depend on a limited set of dates and skeletons. Attempts to recover ancient DNA from such hot environments are difficult, and the relationships between the Kiffian, the Tenerian and later Saharan peoples are not settled.

By the numbers

Timeline

• c. 7700 BC: Kiffian hunter-fisher-gatherers settle beside Palaeolake Gobero.
• c. 6200 BC: A dry interval lowers the lake, and the Kiffian leave.
• c. 5200 BC: Wetter conditions return, and Tenerian people occupy the site.
• c. 3300 BC: The embracing triple burial of a woman and two children is made.
• c. 2500 BC: The lake dries up, and Gobero is abandoned.
• 2000: Paul Sereno’s palaeontological expedition discovers the site.
• 2005–2006: Main excavations take place.
• 2008, August: The findings are published in PLoS ONE.

Why it matters

Gobero shows that the Sahara was not an empty barrier but a changing landscape that drew people in when it was wet and pushed them out when it was dry. Like the rock art of Tassili n’Ajjer, it gives a human face to one of the largest climate shifts of the past 10,000 years.