[Shakes his head.] My whole world is mostly ocean. Just islands otherwise. It's divided into four blues by the Red Line which is the closest thing we have to a continent, it's a bunch of islands squished together that circle the world, and the Grand Line which is a strip of ocean bordered by Calm Belts that runs perpendicular to the Red Line.

The Southbirds are only found in the Grand Line, and that's the same ocean I'm from.