Afrym
Heritage & History

Tassili n'Ajjer: When the Sahara Was Green

High on a sandstone plateau in the Algerian Sahara, thousands of paintings and engravings show giraffes, hippos, cattle herders and dancers. They are a record of a time when the desert was full of life.

By Amos Hope Jnr · · 4 min read

In the far south-east of Algeria, near the borders of Libya and Niger, a vast plateau of sandstone rises above the desert. Wind and water have carved it into a maze of towers, arches, canyons and rock shelters, like the ruins of a giant stone city. Today it is one of the driest places on Earth. But on the walls of its shelters, people long ago painted and engraved a world that looks nothing like the desert: giraffes, elephants, hippopotamuses, herds of cattle, hunters, swimmers and dancers. This is Tassili n'Ajjer, home to one of the greatest collections of prehistoric rock art in the world.

A plateau of rivers

The name Tassili n'Ajjer comes from Tamahaq, the language of the local Tuareg people, and is usually translated as "plateau of rivers". It seems a strange name for a desert. But the plateau is cut by dry valleys that were once flowing rivers, and the rock art shows that the region was once green.

The site covers more than 70,000 square kilometres. It was inscribed as a UNESCO World Heritage Site in 1982, recognised for both its rock art and its remarkable geology and wildlife, including relict cypress trees, Cupressus dupreziana, found almost nowhere else.

The Green Sahara

Between roughly 11,000 and 5,000 years ago, during a period scientists call the African Humid Period, changes in the Earth's orbit brought stronger monsoon rains to North Africa. Much of the Sahara became a landscape of grasslands, lakes and rivers, home to elephants, giraffes, crocodiles and hippos, as well as to people who hunted, fished, gathered and later herded cattle.

As the climate gradually dried, the desert expanded, and people moved south towards the Sahel, east to the Nile valley, or adapted to life around oases. The rock art of Tassili n'Ajjer is one of our most vivid records of this lost world and of how it changed.

Layers of history

There are estimated to be more than 15,000 paintings and engravings at Tassili n'Ajjer. Researchers have grouped them into broad styles or periods. The dates are debated, and some scholars question the sequence itself, but a common outline is:

  1. The "Large Wild Fauna" or "Bubaline" period. Big, naturalistic engravings of animals such as elephants, rhinos, giraffes and the extinct giant buffalo (Bubalus antiquus). These are often considered the oldest.
  2. The "Round Head" period. Mysterious painted human figures with round, featureless heads, some floating or apparently dancing, along with strange shapes. Many interpret these as having religious or spiritual meaning, but their meaning remains unknown.
  3. The "Pastoral" or "Bovidian" period. Lively scenes of cattle herders, with herds of cattle, often painted with careful attention to the patterns of their hides, and scenes of daily life: people gathering at camps, women and children, hunting and possibly ceremonies. This period may correspond to the spread of cattle herding in the Sahara.
  4. The "Horse" period. Chariots and horses, which appear as the climate became drier, perhaps linked to contacts with the Mediterranean world.
  5. The "Camel" period. The most recent, after camels became widespread in the Sahara around 2,000 years ago, along with inscriptions in Tifinagh, the script still used by the Tuareg and described in our story on Tamazight and Tifinagh.

Swimmers in the desert?

Some images seem to show people swimming, or animals such as hippos and crocodiles, which can only live in permanent water. These details have helped scientists understand how wet the Sahara once was. Other scenes show people with masks, dancing or performing rituals, offering a glimpse into the beliefs of the region's early inhabitants.

Discovery and damage

The local Tuareg had always known about the paintings. European interest began in the 1930s, when a French officer, Lieutenant Brenans, reported them. In the 1950s, the French ethnographer Henri Lhote led expeditions that made copies of hundreds of paintings and exhibited them in Paris, making Tassili famous.

But his team's methods caused serious damage: to make the colours clearer, they often wet the paintings, which faded them. Later researchers also discovered that some "ancient" images published from the expedition had in fact been added by members of the team, a hoax that misled scholars for years. This sad episode is a reminder of how fragile rock art is and how important careful conservation is.

Today, threats include tourism, graffiti, theft, and the fragility of the rock itself. Visitors may only enter the park with an approved guide.

A shared African heritage

Rock art is found across Africa, from the Sahara to the San paintings of southern Africa, and it is one of the continent's oldest art forms. Organisations such as the Trust for African Rock Art and the British Museum's African Rock Art Image Project have worked to document it, often in partnership with local communities.

Why it matters

The paintings of Tassili n'Ajjer are both art and evidence. They show the creativity and spiritual life of early African peoples, and they record a dramatic environmental change: the transformation of a green land into the world's largest hot desert. In an age of climate change, that story feels especially powerful. The people of the Green Sahara adapted to a changing world, and they left us a record of it, painted on stone.

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