Yaygir was one of the two Gumbaynggiric languages, closely related to Gumbaynggir, both of which split from the same proto-language, though in developing their differences, their lexical cognate count was reduced to half, 46%. It is considered by Terry Crowley to be the most 'aberrant' of New South Wales languages for its phonology and acceptance of initial vowels, as opposed to the standard formation of words, which normatively begin with consonants, the latter feature something it shares with Nganjaywana. The last speaker was Sandy Cameron of Yamba (d.1973). It had a voicedless trill unique to Australian languages.
Yaygir country stretched from Coffs Harbour northwards to Evans Head, and inland to Cowper on the Clarence River. They were a coastal people. Some reports state that the tribe or horde local to Coffs Harbour itself was called 'Womboyneralah', meaning 'where the kangaroos camped.'
- abl (wallaby)
- dalga (sing)
- dulbay (language)
- duwo (boomerang)
- Crowley, Terry (1979). "Yaygir". In Dixon, Robert M. W.; Blake, Barry J. (eds.). Handbook of Australian Languages. Volume 1. John Benjamins Publishing. pp. 363–390. ISBN 978-9-027-20512-4.
- Kijas, Johanna (June 2009). There were always people here: a history of Yuraygir National Park (PDF). Department of Environment and Climate Change, New South Wales. ISBN 978-1-741-22866-3.
- Lunney, Daniel; Wells, Antares; Miller, Indrie (2016). "An ecological history of the Koala Phascolarctos cinereus in Coffs Harbour and its environs, on the mid-north coast of New South Wales, c.1861-2000". Proceedings of the Linnean Society of New South Wales: 1–48.
- Ryan, J. S. (September 1963). "Some Aboriginal Place-Names in the Richmond Tweed Area". Oceania. 34 (1): 38–55. JSTOR 40329696.
- Tindale, Norman Barnett (1974). "Jiegera (NSW)". Aboriginal Tribes of Australia: Their Terrain, Environmental Controls, Distribution, Limits, and Proper Names. Australian National University Press. ISBN 978-0-708-10741-6.