Edoras:

The capital city of Rohan. Edoras apparently had a dike, wall and thorny fence surrounding it:
"I see a white stream that comes down from the snows," he said. "Where it issues from the shadow of the vale a green hill rises upon the east. A dike and mighty wall and thorny fence encircle it. Within there rise the roofs of houses; and in the midst, set upon a green terrace, there stands aloft a great hall of Men. And it seems to my eyes that it is thatched with gold. The light of it shines far over the land. golden, too, are the posts of its doors."(LOTR.528-529)