The Owndos Sea was an inland sea in northwestern Genabackis. There may have been several names in use for this body of water. It is marked as 'L Blued' on the map of Genabackis published in Memories of Ice, probably meaning 'Lake Blued'. It was bounded to the south by the Owndos Range and fed by the Tarthen, Maly and Fool's rivers. On its eastern shore was the city of Owndos, on the north shore, the city of Blued and at the western end, the town of Stopmouth.