Umbugarla language

Umbugarla or Mbukarla is a possible Australian language isolate once spoken by three people in Arnhem Land, northern Australia, in 1981, and is now extinct.

Consonants

 * /ɡ/ can be heard as either stops or  when in word-final or word-medial position, and as a fricative  when in intervocalic position.
 * /ɽ/ can also be heard as an alveolar tap when in intervocalic position.

Vowels

 * Vowels can be lengthened when in open syllables or in word-final position.

Classification
Umbugarla was once considered a language isolate (together with Ngurmbur as a dialect), but Mark Harvey has made a case for it being part of a family of Darwin Region languages.