The highest point of the Grey Range is Mount Arrowsmith, which reaches just 2,000 feet, about 610 metres, above sea level. Elsewhere that would barely register as a foothill. Here it is the roof of the world. The range itself is more accurately a low divide than a wall, a band of resistant rock and gravel-strewn ridges that the surrounding plains never quite wore down. Its real importance is hydrological. The Grey Range helps sort which way the rare and precious water runs after rain, shedding it toward the channels and waterholes that sustain everything that lives out here. The Yapunyah waterhole, named for the hardy eucalypt that lines so many of these inland watercourses, is one of the range's notable features, a green thread in a landscape where standing water is the difference between survival and ruin.

Long before surveyors lettered these ridges onto maps, this was, and remains, Aboriginal country, read and named by people who knew every rise and soak. The Kuungkari language, also recorded as Kungkari and Koonkerri, belongs to this part of western Queensland; its region takes in the landscape within the local government boundaries of the Longreach and Blackall-Tambo shires, toward the northern reach of the range. For these communities the Grey Range was never empty space to be crossed. It was a living map of water and shelter and story, a network of waterholes and ridgelines that made life possible in country that punishes the unprepared. The waterhole names that survive today are not decoration. They are inherited intelligence about where to find what matters most.

The small settlement of Yaraka sits near the northern end of the range, one of those tiny outback railheads where the bitumen runs out and the sky takes over. From the higher ridges the land falls away into the vast braided plains of the inland, where rivers do not so much flow as spread, fanning across the country in shallow sheets when the rains come and vanishing again into cracked clay. The Grey Range marks a kind of threshold. Cross it and you are deeper into the channel and mulga country, the unfenced interior where distances are measured in days and a single low range can be the most prominent thing you see for an entire horizon.

Travel the inland roads that brush the Grey Range and you learn to recognise it by feel as much as sight: a gradual stiffening of the country, gravel underfoot, the way the gum-lined creeks deepen into proper channels. After good rain the stony slopes can erupt with wildflowers and the waterholes brim and ring with birds, a brief, riotous green that the locals call a boom. In the long dry between, the range goes the colour of old bone and the only movement is heat shimmer. It is a place that rewards patience and reading, a low and ancient horizon that has been quietly organising the flow of water, and life, across this corner of the outback for far longer than anyone has been around to name it.