"The ‘Nh’ represents a lamino-dental nasal, often pronounced with an alveolar nasal ‘n’ by English speakers."
(M. Wilkinson, D. R. Marika, and N. M. Williams. ‘This place already has a name’. In H. Koch and L. Hercus (ed.), Aboriginal Placenames, p. 458. ANU E Press and Aboriginal History Incorporated, 2009.)

"In the case of lamino-dentals, the teeth are slightly apart, and the blade of the tongue touches both sets of teeth, with the tip of the tongue somewhere in the region of the lower teeth ridge."
(R. M. W. Dixon. Proto-Australian Laminals. Oceanic Linguistics, 9(2):79–103, 1970.)