The Heirisson Island area is recognised as being of particular importance to the local Aboriginal community and is registered with the Department of Indigenous Affairs as a site of mythological significance (ID 3589).
The area is traditionally associated with the Beeloo Noongar people who knew the small islands and mud flats as Matagarup, referring to the river as being 'one leg deep'. The Matagarup mud flats were a major river crossing point and the Aboriginal people considered the area to be a place where all tribal groups were free to cross the river unchallenged. It was a place of friendship and co-operation.
The area was also an important food-gathering place, reflected in the traditional name for Point Fraser - Beeabbolup, meaning 'place of many fish.' The Noongar people also used to hunt birds and harvest edible reeds on the islands.
The significance of the area has continued to resonate with the local Aboriginal people, especially due to its rich mythological associations.