Can anyone create such a Mod, Map or Scenario so that the settlement is surrounded by stone rocks?

Ideally, I would like these game scenarios:

1) A scenario where a settlement is surrounded by mountains and there is only one or a couple of passes through the mountains.
It might be like 300 Spartans.
Crowds of invaders are trying to pass through a narrow passage and enter the settlement.

2) A scenario where the settlement is completely surrounded by a ring of mountains.
The area inside the mountain ring may be small. This area is only enough for a limited number of buildings.
The task of the Scenario is to be able to survive in this limited area. Most likely, in this small area you will have to build in turn buildings and fields.


P.S.:
If you know what parameters you need to edit in the files to get a similar map with mountains, please let me know in the comments below.

Thanks a lot!