>>96018756
>Depending on the location of the party on the map.
Which depends on a grid cell (the hex). Which isn't the problem when the map is grid-build, but becomes one when it's a grid tossed over pre-existing map. So now you have a hex that covers an area that isn't lumped under specific biome.
Here, a visual example, which took fucking forever to make due to NOT having a pre-exiting map