An arm of a river, made by water flowing from the mainstream (usually only in time of flood) to form a backwater, blind creek, anabranch, or, when the water level falls, a pool or lagoon (often of considerable extent); the dry bed of such a formation.
Billabongs are often formed when floodwaters recede.
The word comes from the southwestern New South Wales Indigenous language of the Wiradjuri people: bila "river" + bang (a suffix probably indicating a continuation in time or space, or functioning as an intensifier), the combination signifying a watercourse that runs only after rain.
First recorded in the 1830s
1861 Burke & Wills Exploring Expedition...
At the end of a very long waterhole, it breaks into billabongs, which continue splitting into sandy channels until they are all lost in the earthy soil.
2015 Northern Territory News Darwin 13 May...
It will soon offer more activities including fishing at a nearby billabong once the area is declared croc free