|The Ngiyampaa Wangaaypuwan People traditionally occupy the area in the centre of the Cobar Peneplain Bioregion in central west New South Wales. They refer to themselves as the people who speak Ngiyampaa the Wangaaypuwan way. They distinguish themselves from other language groups in the area, these being the Ngemba, the Wiradjuri and the Paakantkji. In addition, Ngiyampaa people group themselves according to their home country. The Pilaarrkiyalu (Belah Tree People), the Nhiilyikiyalu (Neila Tree People) and Karulkiyalu (Stone Country People) thus occupy different areas of the Ngiyampaa language group.|
On 17 July 2004, the Mount Grenfell Historic Site lands were handed back to the Ngiyampaa Wangaaypuwan People, and are held on their behalf by the Cobar Local Aboriginal Council. They have been leased back to the New South Wales National Parks and Wildlife Service (NPWS) under a rental agreement which provides for joint management by the Aboriginal community and the NPWS.