Ritharrngu (N104) is a Yolngu language group affiliated with Yirritja moiety (Schebeck, 2001:16).
The name of this language group is sometimes referred to as Dhiyakuy N149, consisting of the clans Wagilak N106; Manggurra N129 and Ritharrngu (N104). Dhiyakuy is constructed with the demonstrative 'yakuy (this)', but it is not a name recognised by Yolngu (Schebeck, 2001:15). Another name associated with Dhiyakuy N149 is Yakuya N149.
Heath describes Ritharrngu (N104) consisting of mala-Barrtjaray (people of the paper-bark tree) and Bunanatjini N123 (Madarpa N111 sub-groups); Buwarpuwar N217; Mininggiri N218, Wagilak N106 and Ritharrngu (N104), also known as Bidingal N116.B (1980:2). See and use Ritharrngu (N104). See also Birdingal N116.B; Gulunggor N105; Nundjulbi N126 and Madarrpa N111. For Yolngu language groups see Yolngu Matha N230.
The principal concentration of Ritharngu-speaking people was in the general area of the upper Koolatong River (Heath 1980:3). An inland group east and south of the Arafura Swamp and east of the true Goyder River, extending to about the Mitchell Ranges and Koolatong River headwaters; southern boundary near the headwaters of the eastern tributaries of the Goyder River (Tindale 1974).
Ngukurr Language Centre has run intermittent Ritharr?u (and Wägilak) language programs at the Ngukurr Community Education Centre (2005 - 2007; 2019).
Ngukurr Language Centre https://ngukurrlc.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).
Heath, Jeffrey. 1980. Basic materials in Ritharngu : grammar, texts and dictionary: Pacific Linguistics B62. Canberra: Pacific Linguistics.