We did ask for natural barriers. I suppose, in that sense, he didn't disappoint!
Seriously though, I am interested in how these mountains are going to box us in. It seems that either the Capitol is to the Western edge of an open landmass (divided by the mtns to the S and W of Inner Sanctum) or our starting location is a geographic stronghold (surrounded on all sides by impassable terrain).
There are quite obviously choke points. We should attempt to have these areas within our borders. Also, I imagine they will be prime locations for garrisoned forts once tensions rise, whether they are within our borders or not.
Finally, if our region can be used as an indicator for the map, there will be a lot of mountains out there...this means that, potentially, everyone will be faced with a situation similar to ours -- for instance, do we grab the wheat and the gems or the wheat and the river?