Earth Nation

The Earth Nation is the largest of the Nations so it is commonly referred to as the Earth Kingdom and the earth king of ba sing se to have the most control There are other cities as well but they are usually far apart most places where people tend to gather is usually in small villages and usually listen to the headman. The Earth Kingdom is one of the most diverse land wise as there are many farming communities there are also Forests, swamps, deserts ,valleys, Lakes and even Islands let's not forget the numerous mountains that cover it.

( honestly I don't actually know how much control that ba sing se has over the rest of the Earth Kingdom due to the fact there are various rulers/ people in charge throughout it for example king boomi of omashu but besides that the show never really explained much about the Earth Kingdom. The Earth Kingdom also has nobility but I don't even know how Avatar nobility works except for maybe Fire Nation so make it up however you want if you wish to use it )