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Ba Sing Se is the massive capital of the Earth Kingdom, encompassing nearly all of the northeastern corner of the kingdom,.
The city is by far the largest in the world, essentially being more of a small country than a mere city. Ba Sing Se means "Impenetrable City"; the city is so named for its world-famous walls, the gates of which have no hinges or other hardware, and are opened by the use of earthbending. Within the Outer Wall lies a large expanse of farmland, Lake Laogai, and several mountains. The Inner Wall encloses the city itself. The metropolis is also notable for having a unique system of walls dividing the populace into different parts of the city based on social status.