The ocean that spans the eastern coast of the Empire is known as the Unborn sea. The Empire has not attempted to claim the sea in anyway, and the faraway men known as the Unborn are considered the unnamed rulers of these waters.
Little is known of the Unborn themselves, as they reveal themselves to Imperials on only rare occasions. They instead trade with intermediaries, preferring to keep a distance whenever possible.
There are a smattering of islands in the southern reaches of the Sea. These islands are known to be havens for outlaws, pirates and slavers.