Random vs Unpredictable

[Olfart]

On several of the map choices, Medium and Small for example, you have to choose your continent type. One of the choices is "Random" and another is "Unpredictable." Just curious as to the distinction. To me, unpredictable isn't much different from random.

 

[karadoc]

I think "random" chooses one of the other options for you without telling you which one was chosen, whereas "unpredictable" is a type in its own right, in which the shape of the land is unusual.