Австралиядағы су тобыры немесе су көлшегі

Australian term for an oxbow lake or other waterhole

A billabong ('/b//ɪ//l//ə//b//ɒ//ŋ/// BILə bong) is an Australian term describing a small body of water, usually permanent. It is most often defined as an oxbow lake, caused by a change in course by a river channel; however, other types of small lakes, ponds, or waterholes are also described as billabongs in various Australian sources. The term most likely derives from an Aboriginal Australian language of New South Wales, the Wiradjuri language.

The word billabong is most likely derived from the Wiradjuri language of southern New South Wales, which "describes a pond or pool of water that is left behind when a river alters course or after floodwaters recede". According to the Macquarie Dictionary (2005), the original term bilabaŋ means "a watercourse that runs only after rain", with bila meaning "river", and possibly combined with bong or bung, meaning "dead". The attribution of this last part of the word was contested in 2004 by Frederick Ludowyk of the Australian National Dictionary Centre, whose view was that that " bong" or " bang" was a suffix "signifying a continuation in time or space". Ludowyk writes that bong meaning "dead" is not a Wiradjuri word, but may have been picked up or assumed from the word "bung" which was originally a Yagara which was used in the pidgin widely spoken across Australia. The word is first recorded in Australian English in 1836, referring to the Bell River in south eastern New South Wales, when explorer Thomas Mitchell records the Aboriginal name of the river as "Billibang". It is first recorded in its later, more general sense, by J. Allen in 1853: "This station is situated about half a mile inland, over a 'billy bong' (the native name for a small creek or backwater)". It is not recorded in the first edition of the Oxford English Dictionary (prepared 1882–1888), published before the later contributions of the Australian academic Edward Ellis Morris. It appears in Morris's Austral English: A Dictionary of Australasian Words (1898).

Definitions vary. A billabong often defined as an oxbow lake, an isolated crescentic pond left behind after a river loop is cut off when the river channel changes course. Merriam Webster defines the word as: "1. (a) a blind channel leading out from a river; (b) a usually dry streambed that is filled seasonally", or 2. "a backwater forming a stagnant pool" The Cambridge Dictionary describes it as "In Australia, a low area of ground that was part of a river in the past and that only fills up with water from the river during a flood". In a 2009 study, billabongs of the Channel Country (a region of outback Australia whose name derives from the numerous intertwined rivulets that cross it) are alternatively termed waterholes, and described as "enlarged channel segments along the main course of the river typically occur[ring] at the confluence of two smaller channels". Queensland's Department of Environment, Science and Innovation, in its Queensland Waterhole Classification Scheme, describes waterholes as "referred to by a range of different names (i. e. billabongs, lagoons and waterbodies)". Another source describes a billabong as "a large body of water", which may be formed from a section of cut off river, but may also be formed from water left behind after a large flood. Billabongs are usually formed when the path of a creek or river changes due to bank erosion, leaving the former channel deprived of further inflow and becoming a dead end gully holding only residual water that has not yet drained or evaporated. As a result of the arid climate of many parts of Australia, these "dead rivers" often fill with water seasonally but can be dry for a greater part of the year.

Many billabongs are of cultural significance and social importance to Aboriginal and Torres Strait Islander peoples, and used as sources of fresh water as well as other resources. Water is an intrinsic part of Country, and essential resource during drought or dry seasons, and they have many intricate ways of understanding how to find water.

Billabongs are significant because they do not have outflow and can hold water longer than sections of rivers especially during drier season, thus serving important ecological functions as waterholes and habitats for freshwater animal and plant species, including the water holding frog. Many of these species' life cycles are related to the changes in seasons.

Arafura Swamp – many billabongs until the late 1920s. Both Aboriginal Australians and European artists use billabongs as subject matter in painting. For example, Aboriginal painter Tjyllyungoo (Lance Chad) has a watercolour entitled Trees at a billabong. American avant garde filmmaker Will Hindle produced a short film titled Billabong in 1969.

Billabong is the name of an Australian brand of sportswear for surf, skateboard, and snowboard.