Cocoon

From her lofty seat, the world of Cocoon has long enjoyed tranquility. The interior of her spherical shell supports several sprawling cities and a population numbering in the tens of millions. Although a variety of dangerous beasts prowl the wilds, advanced technology and the protection of the world's fal'Cie keepers ensure residents a peaceful and prosperous existence. Travel to the lower world of Pulse is forbidden, but given their deep-seated cultural fears of the place, Cocoon citizens would not even think to venture beyond the paradise they know.