This has undergone a lot of changes for the better. I liked it to begin with, but it has been improved beyond what I expected. So I'll bump my vote up. Good work, keep at it, and I hope you stick around and submit more. Welcome to The Citadel, herrozerro.
Great location! I have a weakness for portals and this is good application of one.
Though, what is preventing a targeted kingdom from putting a wall around the destination point - even it if it covering many square miles, or diverting a river to flood it?
I know if I had such a location in my kingdom I couldn't controll I would. Anyone teleporting in without prior communication would be sprouting many arrows, or drowning.
I just realized that I had never voted on this, and am correcting my mistake now. Lots of improvement to this piece, and a worthy first submission.
Locations (Fortification) (Plains)
There are still a few questions and nitpicks: You should try to explain an odd detail: The mention of the scattered interior buildings. Why weren't they build by military minds? Did the war end just after the walls were made? How could it grow to be feared/desired if all it had was walls? It seems like at least part of the interior should be as structured as the exterior.
Also, a list (maybe a teaser of sorts) of interesting locations the portals can bring you, with brief descriptions.
And what Jerk said.
Other than that, the writing feels a bit bland for such an interesting place. But, I guess not all magical locations can be walls of fire and swirling energy. Good work. Go to Comment