It is still the Mephisto continent, but if you cross the ocean then you’ll meet the mountain which is the edge of the continent.
I practiced magic, even while the sea – which lies as a border – crossed to my side of the horizon. After I went there for the first time I learned that it was called 『Aldorodo』. Its a place with its own unique culture but aside from that there aren’t that many differences from the rest of the Mephisto Continent. I’ve heard that there is a port city in Aldorodo that is frequently traded with; it would take a normal ship about two days to go back and forth from there. That being said, it seems to only be a trip that would only take an hour from here.