According to Blevins (2001:3), this is the southern dialect of Nhanda W14. Some sources consider Amangu to be a Noongar / Nyungar W41 dialect. This may be due to some sources treating the various names for Nhanhagardi A93 and Naaguja A101 as alternative names for Amangu.
Oates (1975) treats Nanagarri A93 and Nanakati A93 as variants of a language she calls Amangu/Njaagurdi, perhaps because of their similarity with 'Njaagurdi' A101?, but Douglas (1976) says that Nanakati A93 is a dialect of Noongar / Nyoongar W41.
Brandenstein (1967, PMS 2125) seems to allude to Naaguja A101 and Nanakati A93 possibly being the same. However, Douglas reports Nanakati A93 as being the language from the Mingenew area whereas Naaguja (and variants), by contrast, is associated with the coast.
Like Oates, Blevins (2001) treats Nhaaguja A101, Njaagurdi A93? and Nyaakurti A93? as alternative names of Amangu, but says that Amangu is a Nhanda W14 language. Documentation on Nhanda / Nanda W14 may be relevant.
... from Geraldton (Champion Bay) south to Hill River and inland to Mullwea (Blevins 2001:3). At Champion Bay; from Chapman River and the southern vicinity of Geraldton south to Hill River; inland to near Mullewa, Morawa, and Carnamah. Southeastern boundary not well defined, somewhere north of Moora (Tindale 1974).
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South West Aboriginal Land and Sea Council - https://www.noongar.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).
Blevins, Juliette. 2001. Nhanda: an Aboriginal language of Western Australia. Oceanic Linguistics Special Publications, no. 30 Honolulu: University of Hawai'i Press.