A highlighted map of the Middle Sea.

The Middle Sea is the sea formed by the Daihexi archipelago, the South Arcesian archipelago, the western border of Arces and the western peninsulas of the northern Borea. It is connected to the Mesoborean Sea to the east and to the Central Ocean to the west.

Its name come from its position at the center of many cultures: the Kwoudangese, the Sâtoun, the Maghan and the Arcesians.