The simple answer is the climate.
Just look at [this map](https://www.researchgate.net/profile/Ian-Barr/publication/279304969/figure/fig1/AS:294326790836224@1447184383255/Climate-zones-and-the-location-of-the-most-populous-cities-within-Australia-The-map-was.png) and consider where you would like to create a colony.
The colonization started with the first British penal colony. The induction was to make a colony at Botany Bay but the anchorage was not good enough and there was not a lot of fresh water so the move-up shot distance to Sydney Cove. Botany Bay is not a part of the city. It is 12 km from Sidney harbor bridge and Sidney Airport extends out into it where land in reclaimed.
A good natural harbor, access to fresh water, and the ability to grow food are what you need if you try to start a colony overseas. There is a limited number of great spots because of the natural harbor requirement and you will see that that initial colonial city will be where good natural harbors exist.
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