Poeppel Corner, Tripoint marker in Simpson Desert, Australia.

Poeppel Corner is a survey marker in the Simpson Desert that shows the exact spot where Queensland, South Australia, and Northern Territory meet. The stone stands in the middle of the remote desert landscape as a physical reminder of where these three borders come together.

Augustus Poeppel led a survey in the mid-1880s to fix the exact line of the central Australian colonial borders. His team hauled a coolibah post to the intersection by camel. The post first stood in a salt lake, but the measuring chain proved a few centimetres too long, so Lawrence Wells resurveyed and moved the marker to its present position.

The point is named after Augustus Poeppel, who led the mid-1880s survey that fixed the central colonial borders. His team hauled a coolibah post to the intersection by camel. The marker was added to the Queensland Heritage Register in 2012, and four-wheel-drive travellers still use it as a landmark in the Simpson Desert.

Reaching this location requires a capable off-road vehicle and careful planning, as it lies more than 170 kilometers from the nearest town. The desert journey takes many hours and offers little shelter or water supplies along the way.

Because the corner sits where three time zones meet, New Year's Eve falls there three times each year at thirty-minute intervals, as it does at Cameron Corner and Surveyor Generals Corner. The marker itself is a coolibah post dragged to the site by camel team.