Avatar is set in a world divided into four nations, each represented by their connection to a different element - the Fire Nation, the Water Tribe, the Earth Kingdom, and the Air Nomads. But the series has had a massive renaissance since it was added to Netflix earlier this summer, and it's not difficult to see why.
To get this out of the way: Yes, Avatar: The Last Airbender was a show that aired in Nickelodeon's Saturday morning cartoon lineup.