An ancient river may have carried stone blocks for the pyramids

A possible solution to the mystery of why the pyramids of Giza were built at Giza has always been a lost river. More than 4,000 years after it started drying up, it may have been found. Scientists from the University of North Carolina have used satellite-based imaging radar to trace what they think was a branch of the Nile used to transport stone blocks to the site of the pyramids starting about 4,700 years ago. It ran 5-10 km west of the main river and appears to have surrendered to drought and desert sands starting around 4,000 years BC. About 30 pyramids were built over the course of 1,000 years along what’s now a desert strip 60 kilometres long. The US team has proposed naming the lost river Ahramat, meaning pyramids in Arabic, and claims to have found evidence of causeways from its banks to the pyramids themselves, presumably used to transport Pharaonic bodies to their tombs. Why were they needed? The entire strip between the Ahramat and the Nile proper may have been marsh.