I couldn't miss the chance to practice my drawing!
Oh, shut up and help me remodel the Koshu page!
Koshu is the name of the biggest and easternmost island of the Hingashi Archipelago.
Koshu is situated east of Othard, separated from it by the Ruby Sea/Tide. Shoshu, the westernmost island of the archipelago, is separated from Koshu 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 Sea let place to The Glass Ocean and nothing is known about the existence of lands further east.
Koshu is the home of Bukyo, the seat of Hingashi's Bakufu, and is currently inaccessible to foreigners due to the isolationist policy of the later.