Input (grade 12): Ubirrâ s proximity to the East Alligator River and Nadab floodplains means that food would have been abundant and this is reflected in much of the rock art here.
Output (grade 5): Because it is close to the East Alligator River and Nadab floodplains, it means that there would have been plenty of food. This is shown in much of the rock art here.