Largest ephemeral lake

Ephemeral lakes contain water only sometimes, and not even following regular seasons. Kati Thanda (aka Lake Eyre) in South Australia is an endorheic system, meaning it has no outlets other than evaporation for its water. It usually contains little or no water but occasionally floods due to heavy monsoon rains in central Queensland. At its fullest, the Australian Government's Geoscience department estimates that the surface area of Kati Thanda can reach as large as 9,690 square kilometres (3,740 square miles).

The basin in which Kati Thanda sits is also the site of the lowest point in Australia, 15.2 metres (49 feet 10 inches) below sea level.