Kariandusi prehistoric site is an archaeological site in Kenya. Located on the southeastern edge of the Great Rift Valley and on Lake Elmenteita, Kariandusi is an African Early Stone Age site, dating to, roughly, 1 million years ago.
There are several theories surrounding certain aspects of the Kariandusi site, including how it used to be considered a factory site, and why the wear on the edges of the handaxes are not typically as worn down as surrounding sites. Due to the sheer amount of handaxes found at the site, Kariandusi was once thought to be a factory for Acheulean handaxes. It was also once thought of as one of the oldest in situ Acheulean hand axe site in the world. When it was discovered, the researchers believed it had been untouched since the last stoneworker had left. However, recent climate research has revealed that nearby Lake Elmenteita once reached further inland, and has receded in the past one million years.
The collection at Kariandusi accumulated due to the water rushing over the land and depositing the hand axes there. The denial of this site as a factory is supported by the lack of waste found at the site. There are no flakes or debris left over from the creation of the handaxes, which one would be sure to find at a designated factory.