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Nabta Playa is located in the Nubian Desert about 500 miles south of Cairo Egypt. It is a large kidney shaped depression within the desert which would fill up with water during the monsoon season. 6,000 to 7,000 years ago monsoons occurred in that ,but are no more monsoons in the area today.
Stone megaliths, like those of Stonehenge in England, were found at Nabta Playa, except they predated both Stonehenge and the pyramids of Egypt. These stone slabs have a north/south alignment, which, during rainfall, would be partially submerged in the lake. There was also a “Calendar Circle” found within the area as well. The stones of this circle were lined up so that they would have aligned with the summer solstice about 6,800 years ago. This was very important to the people of Nabta Playa back then because it marked the beginning of the very important monsoon season.