Xing

Xing is nation ruled by emperor on the far side of great desert. Not much is known about it, because it's so far from Amestris.

Location
Xing is to west from Amestris, separated from it by the great desert. There is also a water route to Xing from Amestris, but it is considered to be "the long way around".

Culture
Xing is ruled by emperors who take wife from every clan of Xing, giving every clan chance to get to power. However, most clans are very small and it is not uncommon that rival clans make assasination attempts against rival princes or princesses. Two known clans are the Yao-clan, from which Ling Yao, Ran Fan and Fu come from and Mei Chans clan. The clans seem to be rivals, as Mei Chan and Ran Fan fight in Dr. Knox apartment.

Technology
Xing have developed hand grenade-like weapons that come in many variations, ranging from flashbangs to explosives. Xing don't seem to use firearms, as Fu was clearly shocked to see how powerful cannon can be.

Alchemy
Xing don't use alchemy like amestrisians, instead they use it to medical purposes. They haven't discovered a way to use alchemy in war. Also, unlike amestrisians, they believe their alchemical powers come from earths veins, called "the veins of dragon".

Trivia

 * Xing is kind of FMA version of China, as people are very skilled in martial arts and have invented portable explosives.
 * Xing were taught alchemy by the wise man from the east.