system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Where did NZ/Australian wizards/witches go?

Where did New Zealand/Australian-born wizards and witches go to learn magic? Given Hogwarts is for United Kingdom wizards/witches.
gpt
Presumably it's the same answer to "where did muggle kids go to school?" Eventually the Wizards built a school for their children. 
 
Hogwarts only has about a thousand students according to Rowling. If we extend that to the real U.K. population. People at the age they'd attend Hogwarts makes up ~12.1% of the Wizard population, making the total number of wizards in the U.K. around 8,300. That's an incredibly small percentage of the total population, and then consider that the U.K. population is nearly 3 times the size of Australia. 

The Australian Wizarding School wouldn't need to be very large, in fact it would be the size of a private school, assuming the rates of Magical ability is the same in Australia as it is in the U.K. There would be a total of around 3,100 Australian Wizards. Australia is almost identical in terms of people in the age range needing Magical education, (12.1%). So an Australian Magical School would only have about 372 students at a given time. 

There's more than enough Australian wilderness capable of sustaining a school for that number of students.