Edo

is the seat of the government in the Land of Mountains, where the country's daimyō and shōgun rule over the land. It is an immense city, which sprawls the coast of the Land of Mountains, with a tremendous palace at the center, where the government resides. It is allied with Yamagakure, the nation's hidden shinobi village, though, prior to the Samurai–Shinobi Civil War, it was allied with the Four Devas and the samurai militia of the country.

Background
The final battle of Samurai–Shinobi Civil War took place in Edo. There, a team of Yamagakure jōnin confronted and fought the Four Devas. While the four weren't killed, the samurai surrendered, and the war was won by the shinobi. The shōgun was replaced by a daimyō, however, a successor shōgun was placed to handle shinobi affairs; a different duty than the position had prior too the shinobi take over.

Trivia

 * is the former name of, the capital of Japan.