In the most recent Korean patch they added a large new ocean to explore, and you can even reach a new continent if you traverse it. You can only explore parts of its shore though (hopefully it's something which will be expanded upon in the future). This video shows traveling to and exploring a coastal town on the new continent (there's ferries controlled by NPCs going from Olvia Coast and Lema Island). I didn't time it, but I think it took around 45 minutes to cross the ocean. There's also a large sea monster which can attack you on the open sea, which can be ever so slightly terrifying (I wasn't able to record it in time when it attacked me)..
0:00 - Travelling to new continent.
1:21 - Exploring coastal town.
6:59 - A look at the map for a sense of scale for how large the new ocean area is.