Looking at the big floods in the Gulf Country at this time brings to mind the lake which once occupied part of Sahul now under sea water.

“The Gulf and adjacent Sahul Shelf were dry land at the peak of the last ice age 18,000 years ago when global sea level was around 120 m (390 ft) below its present position. At that time a large, shallow lake occupied the centre of what is now the Gulf.^” https://en.wikipedia.org/wiki/Gulf_of_Carpentaria (accessed 14 March 2023.

See map from Nature Communications (copyright restrictions – and note source article) https://www.researchgate.net/figure/Map-of-Sahul-Australia-and-New-Guinea-showing-the-distribution-of-reliably-dated_fig1_341454456

Does this lake have a name?

Yes – Lake Carpenteria

“When sea level began to rise after about 12,000 BP, it began having an effect on the lake, a permanent open connection to the sea forming, though between about 12,000 to 8,000 BP it apparently remained as a low salinity water body, partly because the Arafura sill allowed only limited exchange with the ocean, and partly because of the monsoonal conditions with tropical cyclones dumping large amounts of rain on the catchments that drained into the lake. The present Torres Strait was formed as the land bridge between the Australian mainland and the previously connected New Guinea was completely flooded, after which the lake was swamped by the rising sea. Unlike many Australian lakes, Lake Carpentaria never became a dry playa at any time throughout its existence.” M. H. Monroe https://austhrutime.com/lake_carpentaria.htm