Seas of the Sky

There are two seas in the sky: the White Sea and the White-White Sea, with the latter being higher than the former. Both seas are contained in the Millennium Cumulunimbus cloud, a massive cloud, and the sea is actually made up of a substance called sea cloud. Most of the islands are made up of island cloud, with the exception of Upper Yard. Since soil can yield plant life much better than island cloud can, the people of the sky have a religious reverence for it and any material that comes from the Blue Sea. As opposed to the beli of the rest of the world, these seas use extols as currency. The daily life of sky people revolves around the use of dials, which normally aren't available in the Blue Sea. The people are unique in that they have small wings on their backs, similar to the stereotypical angel, though no use has been revealed for them. The two islands seen are grouped together as Skypiea and are both on the White-White Sea, though it should be noted that not every sky island is part of Skypiea.