The map is not intended to be an exact represenation of the lands in Beyond but is meant to provide a general idea of locations and the topography for the purpose of reference in posts. Herds must adhere to the general topography/terrain in their respective territories. If it's a forest, it needs to stay a type of forest. However, a herd may choose to live only in one 'section' of a land, such as choosing to live in the plains and not the foothills or in the forest and not on the beach.