The Wudjari's traditional lands are estimated to have extended over some 6,900 square miles (18,000 km2), encompassing the southern coastal area from the Gairdner River eastwards, as far as Point Malcolm.
At the earliest point of contact with white explorers, it was noted that the western divisions were on the move, shifting towards Bremer Bay.
The groups to the east of Fanny Cove and the Young River, on the other hand, had adopted circumcision as part of their tribal initiatory rites, a transformation that earned them the name of Bardonjunga/Bardok among those Wudjari who refused to absorb the practice.
This customary scission, according to Norman Tindale, perhaps marked the inchoate genesis of a new tribal identity among the easterners, who had also adopted a differential ethnonym for themselves, Nyunga.
In 2002, the historian Martin Gibbs analysed both the book and its historical background and context, and concluded that some elements certainly bore traces of familiarity with the Nyungar cultural bloc.