Official Global Websites

Official Korra USA site
At Nick.com - has show info, games, message boards, and full episodes.

Official Avatar USA site
At Nick.com - Has show clips and games, character info, and message boards.

Old Flash Avatar USA Site
Oh man! The old Flash site at Nick.com with detailed episode info on characters, animals, places, and more. ♥

Official Avatar UK site
At Nick.co.uk - Has games, character info, downloads, and show clips.

Official Avatar Asia site
At Nick-asia.com - Includes show clips, games, and info.

Official Avatar Germany site
At Nick.de - Has character info, episodes in the German dub, tons of downloads, and games.

Official Avatar Japan Site
At Nickjapan.com - Has show & character info, clips in the Japanese dub, and more in the Asobou/Play section (orange buttons, top left.)

Official Avatar Latin America site
At Mundonick.com - Has show & character info, Wordbending game, and a photo gallery.

Official Avatar Sweden site
At Nickelodeon.se - Has show info, games, video in Swedish dub, a quiz, and more.

Other Sites

Korra Nation Tumblr
Features Korra news, art, and the latest on official contests

Bryan Konietzko's Tumblr
See sneak peeks of art more, from Avatar's co-creator/executive producer.

Michael DiMartino's Tumblr
See behind-the-scene info and more, from Avatar's co-creator/executive producer.

Avatar On DVD
The official website for Avatar dvd info, releases, and where to buy.

Fan sites

Avatar Wiki
Incredibly detailed resource for every inch of the Avatar universe.

AvatarSpirit.net
Fansite Giant; has news, screenshots, info, and much more.

Dongbu Feng
Fansite Giant; has news, info, podcasts, and more.

Piandao.org
Gorgeous screenshot and media/graphics gallery.

The Avatar Portal
Has Avatar news, info, episodes, fanwork, forum, and more.

Iroh is Love
Used to be Iroh.org, and perfect for your Iroh fix.

Last Airbender Fans Online
A news fansite for the cartoons and movie.

Blue Spirit Gal
Family friendly site with fanwork, info, and much more.

Fanlistings

For the most up-to-date fanlistings available, it's easier to just check TheFanlistings.org index...

Animation: Character Fanlistings
Listed under Avatar: The Last Airbender and Legend of Korra, The.

Animation: Episode Fanlistings
Listed under Avatar: The Last Airbender and Legend of Korra, The.

Animation: Relationships Fanlistings
Listed under Avatar: The Last Airbender and Legend of Korra, The.

Animation: TV Show Fanlistings
Listed under Avatar: The Last Airbender and Legend of Korra, The.

Communities

Distant Horizon Forum
The official forum for Distant Horizon!

AvatarSpirit.net Forum
The forum for AvatarSpirit.net

The Avatar RP
An ongoing Korra-based original RP forum

Hou Tian
An ongoing Avatar RP forum

Livejournal: Avatar Fans
A large multi-purpose community for Avatar fans

Avatards United
A general Avatar forum

Avatardz
An intellectual Avatar discussion forum, plus character name meanings.

Feng Shui
An Avatar RPG forum that doesn't mess around.