Glackun Hills

The Glackun Hills is a large hill range that surrounds the capital city of Dustatia known as Glass City, The hills have very little vegetation and are extremely rocky, such rocky terrain makes navigation for invading troops very hard or impossible.
The hill peaks are lined with sniper bunkers and sniper towers built by the Quantonian Empire for the Dustation Government, this was a favor to protect the capital city of Dustatia, the defense outposts on the hills prove an effective defense because adjacent to Glackun Hills is the Dustagun Desert which is super flat giving snipers a perfect advantage to take out invading forces.
No invading forces dare to attack over the Glackun Hills unless they have a death wish.