An oasis in the outback

Peery Lake is a ‘terminal wetland’ that has been in severe drought for the last ten years.

The drought-breaking water has come from soaking rainfall in the Warrengo Range catchment in southern Queensland, which flowed on through Cuttaburra Creek and into the lower reaches of the Paroo River. It then took months for this water to move through a complex system of channels, overflow swamps and basins down to north-west NSW before finally reaching Peery Lake. This, along with some help from decent local rainfalls, has filled the lake.

Luckily this isn’t a ‘there one day, gone the next’ event – the water in Peery Lake is expected to stick around for up to three years before it completely dries up. 

The influx of water at Peery Lake means an absolute breeding boom for the plants, invertebrates, frogs, fish and waterbirds who have flocked to the area. 

Head to the lake and you’ll quickly realise that it’s the birds who steal the show though. Up to 40,000 waterbirds in total and 42 species have been recorded at Peery Lake.

There are resident species who call the wetland home, and then there are the international travellers (migratory species) who head to western NSW in droves, from places as far away as arctic Siberia, such as the sharp-tailed sandpiper who stops in at the lake for its tropical vaycay. 

The huge variety of birdlife spotted include the emu, wedge-tailed eagle, brolga, pelican, black swan, pink-eared duck, white-faced blue heron, budgie, bluebonnet parrot, fairy-wren, red-backed kingfisher and the rainbow bee-eater.

Gaze out over the lake and you’ll spy patches of lush green islands springing up, small hills rising from the lakebed like mini volcanoes. 

These strange formations, which look like they would be more at home on a tropical island than in the desert, are called mound springs and are one of the rarest landforms on our continent. 

The mounds are formed when water from the Great Artesian Basin (the ancient freshwater supply underneath Peery Lake) comes up to the surface through fault lines in rocks. This water flowing up to the surface is estimated to be up to 30,000 years old!?

Sediments and salts are left behind from the springs as the water evaporates, creating mounds which can sprout trees and bushes.

These oases in the desert are home to some rare native plant and animal species which are only found here, including the endangered salt pipewort – a small tufted herb with flowering stems which lives exclusively on the mound springs.

The Peery Lake mound springs have great cultural and spiritual significance to the Traditional Owners of this land, the Barkindji Aboriginal people.  

As well as being a vital life source offering reliable water in the dry outback, the mound springs are important in Barkindji dreaming stories about Ngatji, the rainbow serpent. Ngatji lives in the rivers, travels underground from waterhole to waterhole and comes up to the land through the mound springs.

There is a number of Aboriginal rock art sites in the surrounding hills, and rock engraving sites and artefacts can be found around the edges of the lake. 

Peery Lake is listed as a Ramsar site under the Convention of Wetlands of International Importance.

That fancy title means it has been recognised on a global scale as a rare and unique wetland which contributes in a massive way to global biological diversity. Being a habitat where so many threatened species and ecological communities can thrive, it needs to be protected.