Ngan'gikurunggurr is a dialect of Ngan'gityemerri N157 (Reid (1990). Documentation for Ngan'gi N157 may be relevant.
Ngan'gikurunggurr is spoken by about 150 people in the region around the Daly River, most of them living in the communities of Nauiyu (previously Daly River Mission), Peppimenarti, Wudigapildhiyerr, and smaller outstations. Ngan'gikurunggurr has two sister dialects, Ngen'giwumirri N17 (about 30 speakers) and Ngan'gimerri N160 (no longer spoken).
Green and Nordlinger classify Ngan'gikurunggurr as a Southern Daly language closely related to Ngen'giwumirri and Ngan'gimerri N160, with more distant ties to Murrinhpatha N3 and Murrinh Kura N158 (viewed November 2020).
Green, Ian & Nordlinger, Rachel. The Daly Languages (Australia). Web Resource http://dalylanguages.org
... somewhere south-east of Port Keates (Capell 1963 as quoted by Tryon 1974).
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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).
Reid, Nick. 1990. Ngan'gityemerri: a language of the Daly River region, Northern Territory of Australia, Australian National University, PhD.
Reid, Nicholas & Patricia Marrfurra McTaggart. 2008. Ngan'gi dictionary. Armidale: Australian Linguistics Press.
Miriam Rose. 1983. Ngan.gi kurung.gurr: picture dictionary. Batchelor, NT: School of Australian Linguistics. Reid, Nick. 1990. Ngan'gityemerri: a language of the Daly River region, Northern Territory of Australia, Australian National University, PhD. Reid, Nicholas & Patricia Marrfurra McTaggart. 2008. Ngan'gi dictionary. Armidale: Australian Linguistics Press.