This is Ngiyampaa country, and more particularly the country of the Wangaaypuwan, whose name comes from their word for "no." For thousands of years they returned to the waterhole below Mount Grenfell - to drink, to camp, to meet, to hold ceremony. The site sits about 70 kilometres northwest of Cobar, in the arid heart of the state, where survival depended on knowing exactly where water could be found and trusting the routes between those places. The Ngiyampaa knew this landscape intimately: the mallee scrub, the open grasslands, the animals that shared the waterhole. What they left behind is not a relic of a vanished people. The Ngiyampaa are still here, and they still hold this place.

Across three rock overhangs, more than 1,300 images have been recorded - hand stencils, human and animal figures, birds, ceremonial marks, and depictions of food, medicine, and Dreaming stories. The techniques vary. Many are fine linear paintings, drawn by pressing pigment onto stone with a fingertip or a natural brush. Others are hand stencils, made by spraying pigment around a hand held flat against the rock - leaving behind, across centuries, the unmistakable outline of a person who once stood exactly there. In places the artists laid down ochre and white pipeclay thickly, building up colour. These are not idle decorations. They carry ceremonial meaning, and they record knowledge that the Ngiyampaa continue to pass down.

On 17 July 2004, the land was returned to its Aboriginal owners. The Australian government formally handed Mount Grenfell back to the Ngiyampaa Wangaaypuwan people, who lease it back to the state for joint management - only the second time in New South Wales history that land had been returned to its traditional owners under the National Parks and Wildlife Act. It was, in plain terms, an act of recognition: that this place was never empty, never anyone's to take, and that the paintings on these walls were always evidence of an unbroken connection. Twenty years later, that handback was celebrated by the Ngiyampaa community and the wider Cobar district alike.

Today two walking tracks share the site. The short, gentle art site walk leads visitors to the painted overhangs. The longer Ngiyampaa walking track climbs into a wider country of red dirt, mallee, and open plain, where emus, kangaroos, bearded dragons, and geckos still move through the scrub. To visit is a privilege rather than a right. These are sacred surfaces, fragile and irreplaceable - touching them, or the salts and oils of a single careless hand, can do damage that no one can undo. The Ngiyampaa ask only what any people would ask of their most sacred places: come quietly, look closely, and understand that you are a guest in a gallery their ancestors have tended for far longer than any nation has had a name.