Poeppel Corner lies roughly 174 kilometres west of Birdsville, in the heart of one of the driest deserts on Earth. Around it the Simpson rolls out as more than a thousand parallel sand ridges, long red dunes running in near-perfect lines for hundreds of kilometres. The Wangkangurru and their neighbours, who lived in this country for countless generations, knew it as Munga-Thirri - 'big sandhill country' - a name that captures the place far better than any map line. The corner sits beside a salt lake, a pale crust that flashes white against the rust-coloured sand. This is the meeting place of Queensland, South Australia and the Northern Territory, three of the continent's vast interior jurisdictions, converging at a single survey point with nothing around it but space. Few places on the planet feel so precisely defined and so utterly empty at the same time.

The corner's strangest quirk is temporal. Because three states meet here, and because they have not always agreed on the clock, Poeppel Corner can experience New Year's Eve three times over - first as South Australia rolls over, then Queensland, then the Northern Territory, the midnights separated by half-hour offsets. The same oddity belongs to Cameron Corner and Surveyor Generals Corner, Australia's other multi-state junctions. It is a geographer's party trick made real: a single patch of sand where you could, in theory, toast the new year, walk a few metres, and toast it again. Time itself frays at the seams here, pulled in three directions by lines drawn in distant capitals.

The corner takes its name from Augustus Poeppel, who in 1880 led the brutal survey to pin down where the colonial borders actually crossed. His team dragged a coolabah post nearly 90 kilometres by camel to mark the spot at the end of that year. The catch: their measuring chain had stretched about two and a half centimetres too long, nudging the marker some 300 metres off true. A second survey, with Lawrence Wells, corrected the error and shifted the post to its proper place. That a single faulty chain could misplace the meeting point of three states says everything about how hard-won every kilometre of this map really was.

You do not stumble onto Poeppel Corner. Reaching it means a serious desert crossing - dune after dune of soft sand, no fuel, no water, no signal, and a long way to the nearest help. Travellers come via the French Line or the QAA Line out of Birdsville, deflating tyres to claw over ridges, sometimes flying a sand flag so oncoming vehicles can see them crest a dune. Many pair the trip with an attempt on Big Red, the towering dune that guards the desert's eastern edge near Birdsville, before pushing on toward the corner. The reward is a register to sign and a marker to stand beside, alone in a silence so complete it feels physical. The journey filters its visitors: only the prepared arrive, and they tend to remember the emptiness more vividly than the corner itself.