Australasia

/ˌɒstɹɐlˈeɪziə/

/ˌɔːstɹɐlˈeɪʒə/

Australasia

the region including Australia, New Zealand, Papua New Guinea and some islands in the South-West Pacific

Examples

1. Australasia only developed agriculture in Papua New Guinea.

2. Australasia, South America, comment below what are you guys grilling?

3. Actually, for the sake of clarity, I'll use the term Australasia from now on.

4. land bridge opened up in Southeast Asia and Australasia.