Yeah, it's actually pretty interesting to try and figure out what would be going on. Those two seas on either side of Domino's land have such a small entrance I bet it really limits their currents or alternatively causes those two seas to have currents they generate mostly independently. Or maybe not, they are more like very large channels than anything else. I'd also imagine the currents are very strong in the pole oceans. since there is nothing impeding them in any real sense, it would probably also limit ice production or break off huge icebergs to float off around the world.