It is estimated that there are some 255 pyramids of different sizes, were erected between 1070 and 350 a.C. and had very steep steps.

We are not talking about Egypt, nor about Mexico.

We are referring to Sudan, the country that has the largest number of pyramids in the world.

There, along the Nile River, thousands of kilometers south of Egypt, the Nubians built these pyramids during the Kingdom of Kush, in the ancestral Nubia.

Many of them are tombs of the kings and queens who then ruled the region.

Unlike the Egyptian pyramids, where there are some 138 triangular structures, these are thinner and smaller (they are between 6 and 30 meters high).

And according to experts, the size of the pyramid depends on the years of reign of the monarch.

Most of the pyramids are in the place where the city of Meroe once vibrated, whose wealth depended on the iron industry and the international businesses that included India and China.

For the archeologist Derek Welsby, an expert in ancient Sudan and Egypt at the British Museum in London, at that time the fauna and vegetation of the region were very different.

There was a time when one of the driest places on the planet had a population of large game animals and people dedicated to hunting and fishing, "he told the BBC.

It was also a region well known for gold deposits.

"Even today, the separation of gold by the sieve is a traditional activity in the area," said Bruce Williams, of the Oriental Institute of the University of Chicago, who recently discovered discovered a huge gold processing center and a cemetery with about 90 tombs, next to the Nile River, in northern Sudan.