Probably, because in the Adventure Time Stakes Series, the humans Marcelene meet go to another place on a boat. This implies that they were going to another continent or island. Also when you look at the picture of the world you can see that there are multiple chunks of land not connected to each other. We are aware that there is an ocean, so the picture is probably accurate. The question I'm wondering is what inhabits the land? Did the tribe of humans make it? If so is there other humans out there? Could there be more than 2 humans?