This is a comprehensive linguistic description of Kunbarlang (Gunbalang), a highly endangered polysynthetic language of northern Australia. Kunbarlang belongs to the non-Pama-Nyungan Gunwinyguan language family and is currently spoken by nearly 40 people. This work draws on elicitations and analysis of narratives from the author's original field work (2015--2018), as well as those from previous recordings. The main areas covered are the sound system, morphology, syntax, and aspects of lexical and constructional semantics. Dictated by the polysynthetic structure of the language and...