Billabong is an Australian English word meaning a small lake, a section of still water adjacent to a river, cut off by a change in the watercourse. Billabongs are usually formed when the path of a creek or river changes, leaving the former branch with a dead end. Billabongs, reflecting the arid Australian climate in which these "dead rivers" are found, fill with water seasonally and are dry for a greater part of the year.
The word is most likely derived from the indigenous Wiradjuri term bilabaŋ. As the lake/pond kept water longer than parts of the river, it was important to the Aboriginal people to name these areas.
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