From "Spire of the Raven God:"
Hanan Pacha is flat on top, conical on the bottom, hovering above an open sea, like a massive, levitating island. It is ringed and divided by mountain ranges and volcanic peaks. Rumor has it that nothing can fly, dig or walk past the mountains that ring the top of the world. The air up there is very thin and the atmosphere is very cold.
Evil runs amok in the catacombs of the lower half of the conical base. All manner of flying fiends fly in and out of the caverns. They are mingling and conniving with pirates that inhabit a large flotilla of vessels that gather in the sea below. They are docked with massive barges, latched together to create a floating city of debauchery. Ruled by the Pirate Lords, this community's sole purpose is to overthrow those that hold the lush, coveted lands above. Numerous magical gates have also been established within the floating black city and in the lower levels of the cone-base above.
Little is known about the world of the open sea. The whole area is ringed by mysterious fog that is reached within a week’s sailing. No one can remember anyone who has ever entered this fog and returned with evidence that they had reached landfall. Many have returned and others have not, most eventually emerge from the fog, back into this area of the sea! Sometimes newcomers arrive in port but they know very little, they seem to forget what they know about the world outside!