Archaeological work near Uluṟu has shown that people have been in the area for at least 22,000 years. They probably moved in and out of the area depending on how much food and water there was. People started to live in the area year-round about 10,000 years ago. The native Aṉangu people were hunter-gatherers. They lived in small nomadic groups. Groupings were based on water and food supply in their area ("ngura").