A brief look at the world as it is in The Legend of Qiang. The Earth States, as you can see, are numerous, but four of them dominate the region with military and economic superiority. Most of the other Earth States are clients of the four major ones. These four are:
The Kingdom of Omashu, in light, pale blue-green southeast of the United Republic.
The State of Yi, south of Omashu.
The Republic of Zaofu, east of Yi.
And the Republic of Ba Sing Se, which I’m sure you can identify.
Other changes since Korra’s time include a new Air Temple, located on Lake Laogi within the walls of Ba Sing Se.