[Katara shrugs.] It's cold. But it's home.

[And though their pace has been slow and easy, they should soon be coming up to the village square. Katara will lead them towards the restaurant. She's given this explanation a few times by now, but she doesn't really mind.] In my world, the nations are determined by the four elements - Water, Earth, Fire, and Air. There's the Earth Kingdom, the Fire Nation, and the Watertribes. The Air Nomads lived on the four corners of the world, in their temples.