The area roughly bounded by the Stuart Highway to the west, the Arafura Sea to the north, the Goyder River to the east and the Roper River to the south (Evans 2003:6). Eastern limit: The Cadell River drainage, excluding the mouth area which was associated with Burarra, and the headwaters in the plateau which appear to have been associated with Dalabon. Northern limit: This is negatively defined in terms of the known and estimated extents of the coastal languages. Essentially from the Cadell River to Angularli Creek, but not approaching closer than 10-20km to the coast. Western limit: Tor Rock was associated with Amurdak. The upper Cooper Creek drainage from about 20km upstream of Mt Borrodaile was associated with Bininj Gunwok. Downstream of this point was associated with Amurdak. Nimbabirr Hill was associated with Bininj Gunwok. Upper Tin Camp Creek drainage. Myra Falls was associated with Bininj Gunwok. Mudginberri, Jabiru, Mt Brockman, Koongara, Deaf Adder Creek were all associated wtih Bininj Gunwok. There was no precise information in 2007 on the southern limits of Bininj Gunwok associations. The limits have been extrapolated from drainage basins. The East Alligator and Liverpool appear to have been associated with Bininj Gunwok. It is however possible that the headwaters of the East Alligator were in fact associated with Jawoyn. There is no definitive information on the plateau section of the Mann River. Tindale states that the Dalabon were associated with "East of headwaters of Liverpool River; on headwaters of Cadell and Mann rivers." This argues against associating Bininj Gunwok with the plateau section of the Mann River (Harvey ASEDA 802).
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).
Evans, Nicholas. 2003. Bininj Gun-Wok: a pan-dialectal grammar of Mayali, Kunwinjku and Kune: Pacific Linguistics 541, Canberra: Pacific Linguistics.