.
Australia is interesting.
.

.
Flat-earthers really don't like Australia.
.
It's too problematic for them.
.
Here's a grid-layout of Australia with parallel longitude lines. Notice how much larger Tasmania becomes:
.

.
North and south directions are traceable as straight lines on maps and on the ground.
.
But east and west directions are not -- with one exception, which is at the equator.
.
Only on a spherical earth can the equator be a straight line in the same way that all longitude lines are straight.
.
The border between Canada and the USA is a curved line on the ground and on a map.
.
If that were "explainable" as you say, on a "circular flat earth model," then please explain how the equator, which is also a curved line on that "model" is in fact a straight line on the surface of the earth.
.

Funny you mention north/south.
Because there are no north/south orbits of spacecraft.  All orbits are east to west.

.
North and south directions are traceable as straight lines on maps and on the ground.
.
But east and west directions are not -- with one exception, which is at the equator.
.
Only on a spherical earth can the equator be a straight line in the same way that all longitude lines are straight.
.
The border between Canada and the USA is a curved line on the ground and on a map.
.
If that were "explainable" as you say, on a "circular flat earth model," then please explain how the equator, which is also a curved line on that "model" is in fact a straight line on the surface of the earth.
.

We never told you the equator is a straight line.

USA is approx 2, 900 miles across.
Australia is approx 2, 500  miles across.

.
Last time I checked, 2,900 is greater than 2,500.
.
Flat-earth maps:
.

.
Which is larger, Australia or the USA?
.

.
Which is larger, Australia or the USA?
.

.
That one is from the so-called flat earth society, showing Australia to be larger than Asia.
.

.
One of the numerous questions to which flat-earthers have no intelligent answer:
Why are there no maps showing the latitude lines over Australia curving like the ones over Canada/USA do, around the north pole?
.
Maybe flat-earthers don't know what latitude lines are.
.

The horizon always appears perfectly flat 360 degrees around the observer regardless of altitude. All amateur balloon, rocket, plane and drone footage show a completely flat horizon over 20+ miles high. Only NASA and other government "space agencies" show curvature in their fake CGI photos/videos.

The horizon always rises to the eye level of the observer as altitude is gained, so you never have to look down to see it. If Earth were in fact a globe, no matter how large, as you ascended the horizon would stay fixed and the observer / camera would have to tilt looking down further and further to see it.

Maps are not proof of anything.  Lines drawn on them, even less so.  Scientific analysis of reality proves earth is flat.  Whenever globe believers want to debunk something, they always point elsewhere--like a drawn map. Notice they don't look at the earth and the normal functions of things like water, the horizon, levels, line of sight, and all the physical instruments that measure.  Cameras, telescopes, sextants, gyros, lighthouses, compasses, etc. are instruments that do not work on a sphere given the curvature declination necessary to that model, yet never demonstrated or proven. Flat earth scientific and mathematical proofs are never countered in any coherent way, but contrary arguments are sent up like diversionary complicated smoke screens in order to deceive.  There are no proofs whatsoever that earth is a globe.  But there are hundreds of proofs, simple proofs, that earth is not a globe.  Further, all the measuring devices of modern man prove earth is flat.  Fault's Pendulum doesn't even prove globe earth, so globers have zero instruments backing their model.