Discovered by Dr. Stukeley, 1723.

This great enclosure lies to the north of Stonehenge, and veers 6° from due east and west. Like the avenue it is formed by banks thrown up from an outer ditch. It is 9000 feet in length, with a width of 350 feet at its centre, but towards its extremities it narrows. To the west, the southern boundary is irregular. The northern ditch, on the contrary, makes a fairly straight line. Its eastern end is headed by a long mound now difficult to trace. Near its western extremity, and within the enclosure, are two small tumuli irregularly placed. The greater part of this earthwork being on the uncultivated Down is fairly well defined, especially to the west; to the east it has been obliterated by the plough.