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"sea": this refers to a region accessed late in the Chains of Promathia mission series. The region is known as Al'Tieau; it is home to some end-game activities, but is not as widely-used or widely-accessible as "sky".
Actually, the region is Lumoria, not Al'Taieu.
Lumoria zones and Tu'Lia zones somewhat match:
1 Outside "gate" zone: Ru'Aun Gardens in Sky, Al'Taieu in Sea.
2 "Dungeon" zones: Ve'Lugannon Palace and The Shrine of Ru'Avitau in Sky, The Grand Palace of Hu'Xzoi and The Garden of Ru'Humet in Sea.
BCNM zones: The Celestial Nexus and La'Loff Amphiteater in Sky, The Empyreal Paradox in Sea.
Then, there are Limbus zones.
You access them through Al'Taieu, but they're in their own Region.