Ba Sing Se's outer wall is the city's thickest layer of protection. The Wall is huge. Easily a hundred meters tall and perhaps thirty meters thick, it is the largest man-made structure in the World of Avatar. The Wall encircles all of Ba Sing Se, along with the vast agrarian zone and a medium-sized lake. It is considered indestructible and is commonly drawn on maps as a terrain feature. In fact, it has only been breached twice: once by General Iroh, once by the drill. Since then, the Fire Nation has mounted a continuous assault on the city to little avail. The Dai Li mandates that soldiers and sentries be placed on the wall at all times, with many of them even living in built-in homes inside the wall. After the Coup of Ba Sing Se, Dai Li agents tore a hole in the wall to allow Fire Nation soldiers through. The tear had not been repaired by the time the Order of the White Lotus attacked, and apparently the wall was not being monitored at the time.
Today, the wall is fixed and sealed, guarded again by many Earth Kingdom warriors.
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