Djang'kawu

In Aboriginal mythology, the Djanggawul are three siblings, two female and one male, who created the landscape of Australia and covered it with flora. They came from the underworld, Beralku, and were eventually eaten by Galeru.

The two female Djanggawul made the world's sacred talismans by breaking off pieces of their vulvas. They included Bunbulama, a rain goddess.

A possible source:

Djanggawul: An Aboriginal Religious Cult Of North-eastern Arnhem Land
Berndt, Ronald Murray
London, Routledge: 2004 (first published 1952)

includes the "Djanggawaul Song Cycle." Partially available (with other links) on google books