Invasion path

 

Does anyone know what causes an invasion path to be different (ie. cobble stone with ruins, vs dirt path and dead trees, or dead hydras along the route) for some vs others?   Is it tied to decorations or some other attribute I’m missing?  Also a topic that doesn’t look like it’s been discussed in the forum Ive been able to find, and not in the FAQ.

These are pre defined maps.

 

Like all wisdom islands share same design.Same goes for gold and Ambrosia islands too.

Ofcourse all of three of them have diffrent designs.

I see!  This for the clarification!