[1] The estuary has a main basin area of about 0.5 square kilometres (0 sq mi) and the rest is flood and tidal delta.
Uncleared bushland surrounds the estuary which has high dunes to the east and low sediments to the west.
The lagoon is filled with river sediment to the north and beach sand to the south with a long high sandbar that breaks every three to four years.
The estuary functions primarily as a result of wave energy.
[citation needed] The catchment area of the estuary is 30% natural vegetation and 70% cleared for cropping and pasture.