They are the product of erosion in the coastal hinterland and coastal dune forming processes. The extensive dune system covers an area of 650 hectares and comprises a series of parabolic sand dunes of various ages and activities. The dunes range from around 20-60m tall.
The dunes have been forming over thousands of years and archaeological excavations here have uncovered pottery more than 2600 years old, as well as one of the largest burial sites in the Pacific. Evidence of the past is clearly visible throughout the dune system as pottery scatters, stone tools, human remains and other archaeological relics continue to be uncovered by natural processes.