Wagiman is an Australian Aboriginal language spoken in Australia’s Northern Territory. At the moment there are about ten people who speak Wagiman, mostly old people. Wagiman belongs to what linguists call the non-Pama-Nyungan language family. Within that family, it appears to fall into the Gunwinyguan language group, but it is not closely related to any other Aboriginal languages.
There are several dialects of Wagiman, with the most prominent distinction being between matjjin no-roh-ma ‘light language’ and matjjin gu-nawutj-jan ‘heavy language’. Helen Liddy and Lenny Liddy speak light language, and Lulu Martin, Paddy Huddlestone and Clara McMahon speak heavy language. There is not all that much difference, and no Wagiman speakers have any trouble understanding one another.
Ten speakers and “several” dialects! Now, that’s what I call stubborn diversity. (Via Plep.)