It's quite wonderful out here, isn't it?

[There is very little that beats the sensation of being out on the water for Armin. There is such peace and quiet and utter beauty out there, which honestly, can only be matched by being underneath the water.]

It's mainly out here around the islands. You can see Wailmer and Wailords occasionally in other places too, but not as frequently as you can here, so the tours concentrate here. Of course, if you go out on a pokemon, you can also visit those other places.