Usea (ユージア Yūjia) is one of the major landmasses in the Strangereal universe, located between the Osean and Verusan continents. It is surrounded by the Cascade Ocean to the north-northwest, the Spring Sea to the south-southwest, and the Eusian Ocean to the east. The nations of Usea have maintained complex—oftentimes hostile—relations among themselves and, throughout history, numerous armed conflicts have been fought between its peoples. Usea has been a recurring setting for numerous installments in the Ace Combat series.