Koshu

Koshu is the name of the easternmost archipelago in the Far East.

Geography
Koshu is situated east of Othard, separated from it by the Ruby Sea/Tide. Hingashi, the westernmost island, is separated from Daitenzan by the bay of Rasen Kaikyo (not to be confused with the area in the Ruby Sea or the attack from Susano'O). Further east, the Ruby let place to The Glass Ocean and nothing is known if land exists further east.

Mainly composed by the duo of Hingashi and Daitenzan, Koshu is also home to a multitude of smaller islands. As of patch 4.1, only the city of Kugane in Hingashi is open to the players, and little to nothing is known about Daitenzan and it's main city Bukyo who stay isolated from the rest of the world.

Hingashi
The smallest and westernmost of the islands of Koshu, Hingashi is home to Kugane, the only port open to foreigners since the isolation of the islands from the continent following the Garlean Invasion of Othard. As for Daitenzan, little is known of the island outside of Kugane.