Blevins identifies three dialects of Nhanda can be identified: Nhanda, the northernmost dialect, Watchandi W13, the central dialect, and Amangu W12, the southern dialect (2001:3). Thus Nhanda is both a language name and a dialect name.
Marmion (2007 p.c.) says that Ngukaja A101 reported by Gratte (PMS 5968, PMS 4878, MS 4134) might be a dialect of Nhanda as well.
Tindale (1974) lists Buluguda W17 and Daguda W15 as group names of Nanda (W14). However, according to Blevins, Buluguda and Daguda are likely local groups of Malgana W18 (2001:2).
However, the identity of both Amangu W12 and Watjanti W14 is somewhat uncertain. The South West Aboriginal Land and Sea Council's Kaartdijin Noongar page lists Amangu as a 'Noongar dialectical group'. Most sources consider Amangu to be related to Nhanda, but Nhanhagardi A93, which is equated with Amangu by several sources (including Blevins), is treated as a dialect of Noongar / Nyungar W41 by Douglas (1976). Douglas also says that, based on his comparison of the data supplied in Curr, Watjanti W13 is clearly closely related to Watjarri A39 (1981).
Nhanda was spoken in and around the mouth of the Murchison River, north to Gee Gie Outcamp and inland along the Murchison ... possibly from as far south as the Hill River, through Champion Bay, and up to the sandplains north of the Murchison River ... extends north towards Tamala Statioin, and East along the Murchison to the bend at Coolcalalya (Blevins 2001:3, 5).
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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).
Blevins, Juliette. 2001. Nhanda: an Aboriginal language of Western Australia. Oceanic Linguistics Special Publications, no. 30 Honolulu: University of Hawai'i Press.