This final close-reading chapter considers Wiradyuri author Anita Heiss’ Bila Yarrudhanggalangdhuray (2021) as a work of historical, postcolonial ecofiction that asserts Indigenous sovereignty and belonging through a depiction of water agency. It begins with a discussion of the shifting nature of water rights globally and the attentiveness to this issue in First Nations fiction, both in Australia and elsewhere. Heiss’ novel subverts the traditional form of the colonial historical novel through her use of the Wiradyuri language alongside English and her portrayal of colonial dispossession as ongoing rather than an event confined to the past. Alongside these narrative strategies of unsettlement, the novel’s focus on the agency of water and rivers reveals the instability of settler belonging, both now and in the past, the narrative beginning with the historical and catastrophic flooding of Gundagai in 1852—a town built by settlers on a floodplain.