Holmer says Kattang E67 was said to have branched into Birripi (Birrimbai, Bilbai) (E3), spoken about Gloucester (1966:1).
Wafer and Lissarrague (2008:167 - 168) treat Gadhang (Taree dialect) E67, Warrimay E2, Guringay E95 and Birrbay (E3) as dialects of one language, which they call 'Lower North Coast Language'. They locate Birrbay in the region around the Hastings River, citing Branch (in Curr) and other sources to conclude this language was spoken in the region between the Manning River in the south and Wilson River in the north.
Lissarrague uses the word Gathang E67 as the name of the language spoken by Birrbay (E3), Guringay E95 and Warrimay E2 peoples (2010:1), a practice also used by the online dictionary: http://www.firstvoices.com/fr/GathangGathang: 'We, the Birrbay, Guringay and Warrimay people are connecting with our language, our culture and and our history in reclaiming Gathang, the language of our Ancestors'.
... spoken about Gloucester (Holmer 1966:1).
On the southern border of Dunghutti country lies Biripi which was spoken south from a line drawn between Telegraph Point and the country east of where Tamworth is today (Lissarrague 2000).
Birpai - The tribe on the Hastings River (Radcliffe-Brown 1929:400).
Port Macquarie (Branch 1887:348 in Lissarrague 2010:10).
Rollands Plains to the Manning River (Enright 1932:102 in Lissarrague 2010:10).
Mouth of Manning River at Taree, inland to near Gloucester; principally on south side of river, also on the Forbes, upper Hastings, and Wilson Rivers ... (Tindale 1974: 192).
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Gathang Language Group via Muurrbay ALCC https://muurrbay.org.au/
Speaker numbers were measured differently across the censuses and various other sources listed in AUSTLANG. You are encouraged to refer to the sources.
Speaker numbers for ‘NILS 2004’ and ‘2005 estimate’ come from 'Table F.3: Numbers of speakers of Australian Indigenous languages (various surveys)' in 'Appendix F NILS endangerment and absolute number results' in McConvell, Marmion and McNicol 2005, pages 198-230 (PDF, 2.5MB).