The Sea of Blood is a sea east of Arrida and west of the Middle Kingdoms. It is probably based on the Red Sea or the Persian Gulf.

It is connected to the Sea of Rostov by the manmade Channel of Assarania. This channel was dug to support the trade to Nihon-Ja.

The Sea of Blood gets its name from the color of the water when sunlight hits it properly, giving it a red color.