The Four Nations in Avatar: The Last Airbender are the central cornerstones of the worldbuilding in the series. Each nation has its own unique customs and culture, as well as a storied history behind how each one came to be. The Nations all represent one of the four elements, as benders who hail from that Nation will be able to have control over that element. Through Aang's journey, the viewer is able to travel through each of the Nations and learn about each one along the way.