“In this, the 100th episode of the Sustainability Agenda, we speak to Dr Anne Poelina an indigenous Australian academic and human and earth rights activist. Dr Poelina explains her role as a “Yimardoowarra marnin,” which, translated from the Nyikina language, means “a woman who belongs to the Martuwarra River,” in Western Australia. Dr Poelina discusses what she calls “first law,” the Aboriginal peoples’ customary law covering the rules for living in coexistence with nature, the rules of conduct that holds together and bonds a civil society, the principles of an ethics of care. She talks about the indigenous cultural approach to collaborative water governance underlying the legal work that she is spearheading to make sure that the development of the Fitzroy River does not lead to the mistakes made in the development of the Murray-Darling river.”