Billabong Creek is a partly perennial stream in the Riverina region of New South Wales, forming part of the Murray River catchment within the Murray-Darling Basin. Believed to be the longest creek in the world, it stretches approximately 320 kilometres from its source near Holbrook, where the Yarra Yarra Creek and Little Billabong Creek converge, flowing generally westward before joining the Edward River at Moulamein. Over that course it descends 252 metres in elevation, passing through towns including Culcairn, Walbundrie, Rand, Jerilderie, Conargo, Wanganella, and Moulamein.

The lower reaches near Moulamein, where Billabong Creek meets the Edward River, have been paddled by kayakers, with the area noted for ring trees, scar trees, and ancient red gums of cultural and natural significance. The creek passes through flat Riverina country typical of the Murray-Darling floodplain, and its partly perennial nature means water levels can vary considerably depending on season and rainfall.

Near Conargo, a boat ramp at Forest Creek provides one documented access point, with paddlers reporting navigable water both upstream and downstream of that location. The creek supports Murray cod, common carp, and golden perch, which may be of interest to paddlers who also fish. Given its partly perennial character, prospective paddlers should verify water levels before planning a trip, as sections of the creek may be shallow or dry during drier periods.