Did Neanderthals Met Homo sapiens in Africa?

The Arabian Peninsula, which had previously been seen as a harsh desert separating Africa and Eurasia, was made habitable on several occasions during the Pleistocene. Evidence from archaeological studies, climate data, and genetics shows that Arabia went through a number of phases of environmental improvement, which set up temporary routes for human migration, for the expansion of populations and for interaction.

1. Arabia and climate change

In periods when the climate was wetter, the Indian and African monsoons became stronger, winter storms occurred in the Mediterranean region, and changes in atmospheric circulation caused rainfall to reach deep into Arabia. There were at least 21 major wet periods over the past 1.1 million years, during which deserts turned into areas containing lakes, rivers, wetlands and grasslands. It was because of these environmental changes that successive groups of hominins were able to enter and settle in the peninsula.

2. Early Hominin Dispersals

Hundreds of thousands of years ago, hominins from the Middle Pleistocene—most likely descended from Homo erectus or Homo heidelbergensis—entered Arabia. At places like Ti's al Ghadah and Saffaqah traces of Acheulean technology have been found, the technology including handaxes, cleavers, and bifacial tools. The fact that they were there shows that archaic humans had been using the grasslands and fresh water environments of Arabia long before modern humans arrived.

3. The expansion of early Homo sapiens

In the period known as Marine Isotope Stage 5 (that is, about 130,000 to 74,000 years ago), the early Homo sapiens proceeded deep into the interior of Arabia.

At Jebel Faya in the UAE, stone tools dating from about 125,000 years ago indicate a link with the Middle Stone Age technologies of Africa.

In Al Wusta, Saudi Arabia, a human finger bone which dates back about 85,000 years and which was found together with stone tools and remains of hippopotamuses, shows that modern humans were present in an ancient freshwater environment.

The findings cast doubt on the notion of a single, late migration from Africa and instead indicate that there were multiple dispersals via Arabia.

4. Neanderthals in Green Arabia

Neanderthals once lived in parts of what is now called Green Arabia. During periods when the climate was wetter, this region had grasslands, rivers, and lakes. These conditions made it easier for humans and animals to survive. Archaeologists have found stone tools and other evidence showing that Neanderthals traveled through or settled in this area. Their presence in Arabia helps us understand how they moved and spread outside Europe.

A major discovery is the fact that Neanderthals moved into northern Arabia about 60,000 to 50,000 years ago.

At the Jebel Katefeh-1 site near Jubbah, stone tools found in connection with an ancient lake show technological similarities to those of Neanderthals from West Asia. Even though no Neanderthal fossils or DNA have been obtained, the archaeological and environmental evidence indicates that they were present in the area.

This finding also casts doubt on the idea that Neanderthals were confined to cold climates. The fact that they moved into Arabia shows that they had ecological flexibility and were able to make use of semi-arid areas whenever water and food were present.

5. Arabia as a mixture of different human populations

Different archaeological sites reveal distinct technological traditions:

Levallois technology associated with Neanderthals in northern Arabia.

At Wadi Surdud in Yemen there are distinct stone-tool traditions which may be indicative of separate local populations.

At Jebel Faya there were technologies associated with African origins about 125,000 years ago and systematic blade production about 80,000 years ago.

The fact that there are these differences indicates that Arabia was not simply a route for migrations but rather a collection of populations going through processes of expansion, isolation, and recolonization.
In the end, Pleistocene Arabia was not a deserted desert lying between the continents but a lively ecological and demographic environment in which archaic humans, Homo sapiens, and Neanderthals successively lived in it, adapted to it, and moved around as the surroundings changed. Ancient lakes, stone tools, and genetic inheritances contain evidence of some of the most significant episodes in human evolutionary history.