Kumpupirntily (Kumpupintily, Lake Disappointment) is a stark, flat and unforgiving expanse of blinding salt lake surrounded by sand hills, located in the Little Sandy and Gibson Desert of Western Australia. Kumpupirntily translates to ‘bladder burst’; the lake was formed when the bladder of the Jila Kujarra (Two Snakes) burst here. Jila Kujarra is one of the key Jukurrpa (Dreaming) narratives for the Martu. Though the story belongs to Warnman people, it is shared across the Western Desert with several other language groups. The narrative centres on the travels of two snakes as they are pursued by the Niminjarra, spiritual ancestors of the Warnman people. Later in the Jukurrpa period the Ngayurnangalku (cannibal beings) made Kumpupirntily their home, where they continue to remain today. For this reason Kumpupirntily is considered one of the most sacred and dangerous sites of the Western Desert. The Ngayurnangalku are fearsome ancestral cannibal beings said to resemble people in their appearance, except for their fangs and long, curved, knife like fingernails they use to catch and hold their human victims. Coming from Natawalu (Canning Stock Route Well 40) in the north, Mundiwinti (Mundawindi) in the west, and from the Country around Kiwirrkurra in the east, the Ngayurnangalku travelled across the desert, stopping near Puntawarri, at Jilukurru (Killagurra Springs, Canning Stock Route Well 17) and at Kupayura (Savory Creek) before finally reaching Kumpupirntily.