This is a man-made mound of earth 130 feet high, covering over five acres.
The materials collected are used to repair and re-seed eroded areas of the site, the second largest man-made mound in Britain.
Others, built on a natural hill or a man-made mound, were cone-shaped.
It was built on a man-made mound.
East of the bluff are five large man-made mounds two to three feet high and twenty-five to thirty feet in diameter.
Some controversy arises from the burial mound; in that 610 metres might be the top of the man-made mound.
During 1989 and 1990 an intensive surface survey was conducted of the man-made mound in the upper city.
A large man-made mound at Pool was excavated in the 1980s.
The fort was built on either a natural ridge or a man-made mound, we are not certain.
All these large man-made mounds probably were built up over several centuries and originally supporting city palaces and temples.