The Australian city of Perth is further from the current Sydney and Melbourne regions for AWS and Azure than New Zealand is!
Sydney-to-Perth is 3,300 km.
Sydney-to-Auckland is 2,150 km.
Just as how our Kiwi friends are annoyed by high latencies to content served from Australia's east coast, the Aussies in Perth have it even worse.
Not to mention that the fibre doesn't go as the crow flies to Perth. The actual undersea cable length is more like 4,600 km, which is more than double the relatively direct path the fibre takes to Auckland...
All of this pales in comparison to central Africa and all of the former-USSR states, where neither AWS nor Azure have any regions: https://aws.amazon.com/about-aws/global-infrastructure/regio...