Australia’s lowest point is a lake that usually isn’t wet
Kati Thanda–Lake Eyre, about 700 kilometres north of Adelaide, is the continent’s largest ephemeral endorheic lake, sprawling over 9,000 square kilometres when it fills. Most years it is a salt crust; rare floods briefly paint Australia’s driest bowl blue.
Edward John Eyre sighted it in 1840; dual naming in December 2012 restored the Arabana name Kati Thanda beside the colonial label. Native title over most of the lake and surrounds rests with the Arabana after a 2012 Federal Court ruling, while Dieri hold the east and Kuyani the southern shore. Elliot Price Conservation Park (1967) and the larger national park (1985) fence the basin.
Inside the pan sits Australia’s lowest natural elevation, near 15 metres below sea level. North and South basins meet through the Goyder Channel; rivers from Channel Country Queensland decide how much monsoon water arrives. Lake Eyre North stretches about 144 kilometres by 65, while Lake Eyre South measures some 65 by 24, and the local rain gauge averages a meagre 100 to 150 millimetres a year. Typical floods run about 1.5 metres every three years and four metres each decade, with a near-full basin only a few times a century. The 1974 fill was the largest in nearly two centuries.
When water deepens past four metres, salinity can rival the sea; shallower stages dissolve a 450-millimetre salt crust and can trigger fish kills. Once the brine reaches saturation at around half a metre deep, beta-carotene pigment turns the water pink. In the northern lake the crust reaches its greatest thickness, as much as 50 centimetres, around Madigan Gulf, Jackboot Bay and Belt Bay. BirdLife flags the flooded lake as an Important Bird Area for banded stilt and Australian pelican breeding.
Early European visitors split sharply: in the 1860s Peter Egerton-Warburton found only a dead, silent expanse, and in 1906 geologist John Walter Gregory noted that some called it a fertile land of lakes and others the worst kind of desert. On the flats, Donald Campbell’s Bluebird-Proteus CN7 hit 403.10 mph on 17 July 1964—still a Class A landmark on a lake that spends most of its life as empty glare.
Source: Kati Thanda–Lake Eyre
