1. Territorial Boundaries & Northern Alluvial Geography

The Yuat Sovereign Subnation (Yued, Juat, W8 in AIATSIS classification) held sovereign authority across the northern alluvial plain and river systems connecting the Darling Range with the Indian Ocean.^[1] The Yuat estate covers the entire catchment of the Moore River, extending from Gingin Brook and Guilderton in the south, northward through Moora and New Norcia to the Victoria Plains, bordering Amangu lands at the Hill River divide.^[1][2]

Yuat country occupies a pivotal ecotone between the lush southern forest biome and the semi-arid northern scrublands, structured by defined custodial hearth estates (kalla-boodja):
Gingin-borung: The southern estate flanking the perennial freshwater springs of Gingin Brook, celebrated for hyper-abundant waterfowl and tuber grounds.^[2][3]
Moore River Estuary: The coastal lagoon and limestone sandbar where migratory estuarine fish were trapped during winter floods.^[3][4]
Victoria Plains (Maura): The broad upland valley of Moora and New Norcia, governing fertile vertosol soils that hosted extensive yam fields.^[4][5]

2. Warrine Yam Agronomy & Sir George Grey's Field Observations

The Yuat people developed the most intensive root-crop agro-ecological systems recorded in south-western Australia.^[6] During his 1839 expedition, explorer Sir George Grey encountered continuous, miles-long tracts of carefully cultivated wild yams (Dioscorea hastifolia, Warrine) in the Victoria Plains and Hutt River valleys.^[6][7]

Grey documented that the entire landscape had been systematically tilled with digging sticks (wanna) to a depth of several feet, creating soft, aerated beds covered with small holes where tubers had been excavated and replanted.^[7][8] Customary law prohibited outsiders from digging in these communal plots without permission, and women actively engaged in propagation by returning the severed tops of tubers back into the turned earth, establishing a sophisticated pre-colonial agronomy.^[8][9]

3. Moore River Hydrology & Estuarine Fish Trapping

The Moore River follows a complex, meandering course that terminates in a large coastal sandbar at Guilderton (Garban).^[10] During the winter floods (Makuru), the swollen river breaches the marine sandbar, creating a dynamic brackish estuary into which massive schools of marine fish enter to spawn.^[10][11]

Yuat engineers erected extensive brushwood weirs (kallang) across the narrow river necks, allowing water to filter through while impounding sea mullet, tailor (Pomatomus saltatrix), and bream.^[11][12] Women gathered fresh water mussels (Westralunio carteri) and harvested paperbark (Melaleuca) from river margins to construct weatherproof shelter roofs (Mia-mias) and soft cradle wrappings for newborns.^[12][13]

4. The New Norcia Mission, Moore River Settlement & Unceded Title

In 1846, Spanish Benedictine monks led by Dom Rosendo Salvado established the New Norcia Mission on Yuat land without customary consent.^[14] While Salvado recorded valuable ethnographic descriptions of Yuat language, kinship, and plant usage, the mission functioned as an engine of cultural assimilation that institutionalised Yuat children and alienated ancestral lands.^[14][15]

In the twentieth century, the state government established the notorious Moore River Native Settlement (1918–1951) within Yuat country, which became the central carceral institution for the forced removal of Aboriginal children under Chief Protector A. O. Neville.^[15][16] Despite devastating institutional violence, Yuat cultural custodians maintained their spiritual connection to the Moore River and defended their sovereign birthrights.^[16][17] Under the principles of Mabo [No 2]* and international human rights conventions, Yuat sovereign rights remain living, unextinguished, and inalienable.^[17][18]