The Eastern Sea is the island-dominated area off the east coast of Dabusen. It is equally in the Black and Great Southern Oceans.

Seas of the Eastern Sea:
Eastern Sea
Sea of the Nine Princes
Rolling Sea

Nations of the Eastern Sea: "contains" indicates that a nation includes but is not limited to a particular sea.
Jin'jao - contains Sea of the Nine Princes
Ios
Djadin - contains Rolling Sea

Islands of the Eastern Sea: or island chains, rather
Tun'Voh - Orang minyak, Hantu raya
Muroa
Chaleb
Gamayaran - Bokken, Toyol, Langsoir, Pocong
Wetanu - Ambrosian, Gustavo
Limazar - Suf'ka'ar
Tenzanai - Yame-bito, Hibagon
Manikiri - Tennin, Nando-baba, Hitodama