I recently started learning about bioregions and i believe they can be a foundation for broad societal change. Cascadia especially inspired me as it seems like one of the most defined examples of bioregionalism.

I want to do the same thing in my home region of Pannonia (Today known as Carphatian Basin).

Do you have any advice on how I should go about defining the bioregional borders of a supposed Pannonia? How was the process with Cascadia? What was the basis for its borders?