Munga-Thirri National Park, Protected sand dunes expanse in Queensland, Australia.

Munga-Thirri National Park covers 10,120 square kilometres of the Simpson Desert in western Queensland, 1,495 km west of Brisbane. Its parallel sand dunes, mostly 10 to 35 m high and about 1 km apart, run northwest; the longest ridge is 200 km. Big Red rises 35 km west of Birdsville, and salt lakes and claypans lie between the dunes.

A national park in the Simpson Desert was first suggested in 1965 by the National Parks Association of Queensland. The park was extended northwards in 1991, adding arid lands with a more diverse range of vegetation. Since July 2019 the head ranger has been Don Rowlands, Elder of the Wangkangurru people and traditional owner, based in Birdsville.

Aboriginal peoples have inhabited this desert for thousands of years, developing deep knowledge of water sources and navigation techniques essential for survival. This heritage remains visible through traditional stories and connection to the land that define the region's cultural identity.

The park requires four-wheel-drive vehicles and becomes extremely hot during summer months, making visits uncomfortable without proper preparation. Visitors should bring adequate water and supplies while expecting limited facilities and services.

At Poeppel Corner, visitors can stand simultaneously at the border where Queensland, South Australia, and Northern Territory meet. This spot attracts those seeking a photo at the junction of three states at once.