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Holroyd River
From the steep rainforest-clad slopes of the McIllwraith Range in eastern Cape York, the wild Holroyd River journeys westwards through tropical savanna country before becoming a jumble of meandering forested streams in a sea of salt pans and extensive floodplains. The intense waters of the Wet replenish one of Australia’s largest floodplain areas, inviting a wealth of birds from all over the world and replenishing the mangroves and marine environment with fresh water and vital natural nutrients.
Morning mist over a stream of the McIllwraith Range in the very upper reaches of the Holroyd. Photo: Kerry Trapnell
Conservation and cultural values
From the tropical savanna woodland, to scattered stands of the broad-leafed Paperbark, to the mosaic of grassland, beach ridges and wetlands near the coast, the Holroyd River catchment is a diverse and dynamic landscape.
The large Darwin Stringy-bark woodlands of the Holroyd catchment are among the healthiest on Cape York, while the fig tree dominated vine forests close to the shores of the Gulf of Carpentaria are also considered some of the best developed in the region.
The coastal fringe of the Holroyd catchment is a mosaic of freshwater lakes, broad shallow estuaries and seasonally flooded woodlands.
For most of the year, the Holroyd River itself comes to a near stand-still, as the dry tropical sun evaporates the river flows. But as the dry season slowly lurches towards its end, the rising heat and moisture hit a threshold and the wet season storms arrive abruptly.
The large movements of water during these torrential downpours shape the landscape of the Holroyd River, as they do for much of Cape York. The huge floods that breach the river banks during the 3-4 months of the wet replenish the wetlands and waterholes of the Holroyd River system with fresh water and nutrients.
The extensive wetlands of the Holroyd are virtually devoid of invasive weed species – a rarity on a continent plagued with choked waterways. In some of these wetlands, particularly on the Karumba and Holroyd plains, the unusual and rare Noble Palm sits.
A number of large shell mounds are found on the west coast of this wild river catchment – testament to the ongoing presence of Indigenous people. The Bakanh, Wik, Thaayorre and Kaanju people are the Traditional Owners of the Holroyd River catchment area and maintain strong cultural and spiritual connections with the land and rivers. The traditional ecological knowledge and health of these communities is in turn critical to the ongoing health of this wild river system.
Threats
Major threats to the wild river values of this area include encroaching invasive weeds, growing numbers of feral pigs, and under-investment in land management. Wild River protection, as well as the Indigenous Wild River Ranger program, will help address these impacts and resourcing issues.