Beginning in the Stone Age, Neolithic herders descended into and occupied these vast tunnels, known as lava tubes, archaeologists have discovered. Umm Jirsan spans nearly 1 mile (1.5 kilometers), with passages that are up to 39 feet (12 meters) tall and as much as 148 feet (45 meters) wide. The researchers enter Umm Jirsan, the longest lava tube system in the region. Animal carvingsIn another tunnel near Umm Jirsan, the researchers found 16 panels of engraved rock art. “Collectively, the archaeological findings at the site and in the surrounding landscape paint a picture of recurrent use of the Umm Jirsan Lava Tube over millennia,” Stewart said.

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Persons: Jirsan, haven’t, Umm, ”, Mathew Stewart, ” Stewart, Umm Jirsan, Guillaume Charloux, Charloux, Stewart, “, —, ” Mindy Weisberger Organizations: CNN —, Australian Research Centre, Griffith University, CNN, Umm, French National Centre for Scientific Research, ’, Saudi Geological Survey, Arabia, Scientific Locations: Medina, Saudi Arabia, Umm Jirsan, Australia, Arabia, Asia