After the Parting, only the Dragons, Demons, Humans, Elves, Beasts, and Dwarven race remained. Even back then, the Beasts included the Dragons, meaning there were only five.
So, for Vexthra to say there were seven, something ought to be wrong somewhere.
"Actually, even back then, there were five known continents, simply because the other two isolated themselves from the other five races," she sighed.
"The sixth race back then was the Marine Race. They are creatures of the sea. I don't know if you are aware of this, but there is a sea in this world known as the Black Sea," Kent nodded.
He had already seen it when he battled the sect master after he and the ladies rescued Nara and Zaila.
"That is their territory. Back then, it was just a small island nobody dared to traverse. However, after the Parting, it expanded, creating a blockage that prevented other races from casually crossing to other continents.