Lake Eyre (ɛər ), officially known as Kati Thanda–Lake Eyre, is an endorheic lake in the east-central part of the Far North region of South Australia, some north of Adelaide. The shallow lake is the depocentre of the vast endorheic Lake Eyre basin, and contains the lowest natural point in Australia, at approximately below sea level. On the rare occasions that it fills completely, it is the largest lake in Australia, covering an area of up to . When the lake is full, it has the same salinity as seawater, but becomes hypersaline as the lake dries up and the water evaporates.
The lake was named in honour of Edward John Eyre, the first European to see it in 1840. It was officially renamed in December 2012 to include its Aboriginal name, Kati Thanda, in accordance with a policy of dual naming. The native title over the lake and surrounding region is held by the Arabana people.
Kati Thanda–Lake Eyre is in the deserts of central Australia, in no