Art De La Guerre

[Hazelbark]

p 67 where it indicates the terrain options.

Under the line Gentle and Steep Hills.

Some regions specify G other S and some neither.

I presume, but want to confirm that if the letter appears in that region then ALL hills selected must be of the type

i.e. in Mountains all hills are Steep, not just the mandatory.
Therefore Desert and Forest may have a mix of hill types.

[JLouis]

Yes.
i.e., in steppes, you can place 3 gentle hills, 1 being compulsory. No steep hills in steppes.