Taking into account:

- Size: neither too big nor too small (Singapore is about 700 square kilometers).

- Geographical position: climate (which will change), sea level (which will change, attention to coastlines), topography, soil quality (possibly).

- The strategic position: trade routes, access to the sea (possibly).

- Colonisibility: a piece of land that is disputed, under-exploited, purchasable, etc.

Any idea ?