Ba Sing Se is the titanic capital of the Earth Kingdom, encompassing nearly all of the northeast corner of the kingdom. It was the last great Earth Kingdom stronghold after the fall of Omashu. The city is by far the largest city in any of the Four Nations. Ba Sing Se means "Impenetrable City"; the city is so named for its two world-famous walls, the gates of which have no hinges or other hardware and are opened by use of Earthbending.
