There isnt the 3rd was the last but they are making a spin off series the legend of korra
Update (28 September 2013): If you're looking for a direct sequel to the events of Avatar: The Last Airbender, there are a couple comic books series that start directly with the shows ending and continue from there:
The first is the three-part "The Promise", which is somewhat complicated to explain and you should read it. It has been collected in one hardcover trade edition.
The second is the three-part "The Search", which (as the name implies) is the search for Zuko's mother which was teased in the finale of the series.
Another comic series is planned after The Search (though the name escapes me). It is worked on (or at least supervised) by some of the original creators.
Sadly, there will not be a fourth season. Avatar ended with season three, after Ozai was defeated. However, the movie based of off the series is almost in theaters.
there is no forth season.
There isn't a season 4
NO!!!!!!!!!!!There is NOT going to be avatar book 4!!!!!!!!!!BUT theres going to be another movie
avatar 3 is coming out in 2019
It's "The boiling rock" and its in two parts, check google
There is no way Avatar The Last Airbender is going to have a fourth season. Aang and his friends are all dead. The creators of the show have made The Legend of Korra and it's about the life of the new avatar,Korra. None of the old characters from Avatar The Last Airbender are in The Legend of Korra, but Katara is still around and so are Aang's son and Toph's daughter. So if your a huge Avatar fan, watching The Legend of Korra should bring back those funny moments you had in the other Avatar show.
I've been looking around and until now all webs say there will be no season 4.
Unfortunately there is no season 4 coming out but there are 3 live-action movies coming out the first of which will be realised in mid 2010.
avater season 3 will countinue into season 4 which starts July 14 2008 AVATar is DUMB
NO
NO!!!!!!!!!!!There is NOT going to be avatar book 4!!!!!!!!!!BUT theres going to be another movie
There might be a season 4 but a season 5 is not yet predicted
there is no season 4 coming out because they finished after season 3
There is no season 4.The only thing after season 3 is the movie directed by McKnight Shamalon.It is showing in July.
The Legend of Korra which is coming out somewhere near September in 2011 :)
avatar 3 is coming out in 2019
There isn't a Book 4, or Season 4. There's only 3 seasons
Season 4 airs on September 13th
There is no book 4