Along the coasts of Brunei, and the Malaysian Bornean states of Sabah and Sarawak facing the South China Sea.

Agaronia java new species, has a shell shape that is distinctly more cylindrical compared to its Sundaic congeners. Some forms of Agaronia gibbosa can be very similar in shell colouration, but that species has a fasciolar band with blotches or flammules not seen in this species. Agaronia lutaria similarly has a fasciolar band without prominent markings, but can be distinguished from this species by its different shell shape and cloak colour.

In specimens of Agaronia java with a mature thickened lip, the middle part of the lip is noticeably thickened like Agaronia adamii, but confusion with the latter species is unlikely.