Lake Callabonna, Protected salt lake in South Australia.

Lake Callabonna is an isolated salt lake in South Australia's Far North, covered by white salt deposits that stretch across the land. The terrain is flat and sparsely vegetated, with exposed mineral layers that reflect thousands of years of geological history.

The discovery of giant skeletal remains in 1892 sparked a series of scientific expeditions funded by wealthy patrons. These investigations in the late 1800s transformed the location into a site of international scientific importance for understanding extinct animal life.

The sources record no Aboriginal origin for the name Callabonna; the lake is also called Lake Mulligan. The fossil finds came to light in 1892 when the station hand Jackie Nolan showed giant skeletons to the station owner F. B. Ragless, after which the South Australian Museum sent H. Hurst to investigate.

Access to the fossil reserve is restricted, and the site lies on private pastoral land, so permission must be arranged in advance. The lake is about 120 km southwest of Cameron Corner, deep in the Far North; bring your own vehicle, water and fuel. The Dingo Fence runs along the western shore of the southern end, a useful landmark.

The well-preserved complete skeletons of extinct marsupials found here show anatomical details that rarely survive elsewhere. These discoveries allowed scientists to understand the actual size and way of life of these ancient creatures far more precisely than through broken bones alone.