1. Catchment Physiography & Fluvial Geomorphology

The Djarlgarro Beelier (the Canning River) forms the primary southern tributary of the Derbal Yerrigan estuarine basin, descending from granitic headwaters in the Darling Plateau near Ashendon and Araluen, flowing westward through the Darling Scarp, and meandering through the sandy palusplain of the Swan Coastal Plain to merge with the main estuary at Canning Bridge (Melville Water).^[1]

Under customary law, the river represents the central ecological and geopolitical spine of the Beeliar clan estate, stewarded under the hereditary authority of Midgegooroo, Yagan, and Munday.^[1][2] The upper catchment is characterised by incised, rocky gorges cutting through Archaean granite and dolerite dikes, while the lower reaches form an expansive lowland estuary featuring saline mudflats, freshwater wetland lagoons, and sheltered paperbark (Melaleuca) swamps.^[2][3]

2. Wetland Agronomy & Freshwater Hydrology

The hydrological dynamics of the Djarlgarro basin supported an intensive plant husbandry and freshwater foraging economy.^[4] Along the low-lying alluvial terraces of modern Gosnells, Kelmscott, and Cannington, Beeliar women maintained vast fields of native bullrush (Typha domingensis, Yanget).^[4][5]

The starchy rhizomes of the Yanget were systematically excavated using heavy wooden digging sticks (wanna), which loosened and turned the alluvial soils, creating soft, aerated beds that stimulated rapid plant regeneration.^[5][6] In the adjacent seasonal freshwater swamps, custodians gathered freshwater tortoises (Chelodina colliei, Booyi), freshwater mussels (Westralunio carteri), and waterfowl eggs, managing water flows through shallow earthen diversions to maintain optimal wetland water depths through the dry summer months.^[6][7]

3. Estuarine Trapping & Intertidal Shellfisheries

At the saltwater-freshwater transition zone between Shelley and Salter Point, the Canning River widens into shallow estuarine reaches that supported rich intertidal fisheries.^[8] Beeliar hunters utilised split-stick brushwood fish hurdles across narrow river channels to trap shoals of yellow-eye mullet (Aldrichetta forsteri), black bream (Acanthopagrus butcheri), and flathead (Platycephalus spp.).^[8][9]

Along the sandy shallows, women and children harvested enormous quantities of estuarine bivalves, particularly the mud cockle and saltwater mussels, cooking them in open earth ovens (kallang) lined with heated river stones and damp rushes.^[9][10] These cooking sites produced substantial stratified middens along the river foreshore, documenting millennia of continuous, intensive marine harvesting.^[10][11]

4. Frontier Invasion, Land Grants & Unextinguished Custodial Sovereignty

In late 1829, Surveyor-General John Septimus Roe surveyed the Canning River into 29 narrow linear ribbon grants, directly allocating Beeliar ancestral lands to British settlers including Thomas Peel, William Bickley, and the Phillips family without consultation or purchase.^[12] Settlers immediately erected fences across traditional transit tracks, cut down paperbark groves for timber, and turned sheep onto sacred Yanget yam beds.^[12][13]

Midgegooroo and Yagan launched determined military operations to defend their ancestral river corridor, asserting their sovereign rights to hunt livestock as lawful compensation for alienated resources.^[13][14] Following Midgegooroo's summary execution by firing squad in 1833 and Yagan's assassination, colonial authorities enforced military dominance over the basin.^[14][15] However, Beeliar custodial connection to the Djarlgarro was never legally broken or voluntarily ceded.^[15][16] Under modern jurisprudence following Mabo [No 2] and international human rights conventions, Beeliar customary sovereignty across the Canning River basin remains permanent and unextinguished.^[16][17]