Since you all brought it up
Eryth Sea
Eryth Sea is a great ocean on the head of the Bionis. This is the place Shulk saw in a vision and becomes a turning point in the story. It boast not only a view of the Bionis, but Prison Island and Alcamoth, the High Entia capital city. You really get a sense that you are on a god in this stage
You fight a top a hovering reef. The green is the reef. The blue platforms are made by the High Entia. The ones with a red dot are transporters and can move you from the main reef to a smaller one on the side. It may be best to try and control the small one in a stock match. To teleporter, just stand under the dot. While this is an ocean, there is no swimming. Your so high up that you'll fall into the blast zone first. As the battle rages on, you'll see the time change from day to night. You can even see shooting stars!