Square-nosed snakes are found in the very far southern coastal areas of the Australian state of Western Australia,[2] ranging from approximately Esperance in the east to somewhere west of Walpole.

They typically inhabit swampy depressions in low heath and open forest, often overlapping in habitat with Elapognathus minor, the short-nosed snake.

There is also a strong ontogenetic shift in colour pattern, where neonates are dorsally blue with a yellow lateral region.

[3] The square-nosed snake is a reptile specialist, feeding primarily on scincid lizards such as those in the genera Ctenotus, Hemiergis and Morethia.

Gravid females have been collected in October and January, suggesting similar reproductive patterns as for other southern elapid snakes in Australia.