bil·la·bong 
(bĭlə-bông′, -bŏng′)
(bĭlə-bông′, -bŏng′)n.
Australian
Australian
1. A dead-end channel extending from the main stream of a river.
2. A streambed filled with water only in the rainy season.
3. A stagnant pool or backwater.
[Wiradhuri (Pama-Nyungan language of southeast Australia) bilabaŋ, watercourse filled only after rain.]