Sarsen boulders lie scattered in substantial “drifts” across the landscape of the Marlborough Downs near Avebury.
By contrast, close to Stonehenge there are almost none. This is one of the reasons why most archaeologists believe that the large sarsens for the monument were not locally sourced.
There are, however, a few examples of substantial sarsens dotted about Salisbury Plain within a couple of miles of Stonehenge. And there are tantalising hints that others used to exist.
