Lake Disappointment, or Kumpupintil/Kumpupirntily in the Western Desert Language, is an endorheic
salt lake and is one of the largest Playa lakes in Western Australia covering 330 km2 and draining an area of the
Great Sandy Desert over twice that size. The
Canning Stock Route passes along the northern edge of the lake before veering further south west in the vicinity of the Savoury Creek.
Frank Hann in the course of an exploring/prospecting expedition, travelled east from
Nullagine to sight and name the lake on 20 April 1897. Hann had travelled from
Nullagine across the
Davis River to the Coolbro Creek, then to the southeast following and naming the
Broadhurst Range, crossing the upper
Rudall River and the Cotton Creek as far as the Harbutt Range where he turned south to the Mckay Range. Here he noted that many creeks were draining southward and he sighted a large lake ten
miles distant. Making their way to it next day, Hann found it was all white salt.
“It is the largest thing in lakes I ever saw ... I shall call the lake Lake Disappointment as I was disappointed in not finding water in it”.
In 1978, WA academic Robert Tonkinson, who had spent years studying the Martu, documented their fears. "Numerous stories were told to me about a person or people who had been foolish enough to trespass, and the tragic result that ensued."
Lake Disappointment is one of the Martu people's most sacred sites and in indigenous culture, was off-limits to the tribes neighbouring the area. The reason for the taboo, existing down to modern times, derives from the lake's mythological associations with the Ngayurnangalku spirits thought to live below its surface. This prohibition even extends to flying over the area, since the Ngayurnangalku, ancestral cannibal beings with pointy teeth and claw like fingernails, are deemed capable of ripping down aircraft that intrude over the lake's airspace.
In his memoirs of Warri and Yatungka, Stan Gratte also makes mention of Mudjons fear at being near the lake and that would not even look across its vast expanse for fear of the demons that dwelled there.
More than a century later, Reward Minerals identified 24.4 million tonnes of potash within its boundaries sparking a possible mining boom and source of royalties for the Martu people.
Visible from CSR between wells 19 and 21 where Savory Creek enters the lake. As there are no high points from which to view the lake, it is a blurry shimmer in the heat haze. From eye level standing on the edge of the salt you can only see 5km. A 4km track at the creek mouth takes you closer but makes no real difference to any view with the horizon 8 km away at the 5m elevation you'd get by standing on your 4by roof and the angle of your view is too shallow to see much at all. Better to go to
Lake Gairdner in SA.