The world is flat, and roughly rectangular. The long axis runs roughly east-north-east by west-south-west, or perhaps even closer to east-west than that. Most of civilization is in a (comparatively) small lump near the northern rim mountains, stretching southward along the rim of the great Circle Ocean.
Go too far east, and you hit the Wilds. Too far west, and the depths of the Circle Ocean consume all but the most hardy of mariners. South, and eventually you reach the jungle domain of the Hrassa Empire - and where they still hold power, intruders are strongly discouraged. Too far north, of course, and you fall off the edge of the world.
The sun still rises in the east and sets in the west, arcing across the sky by the will of Marris.
There are three moons.
Kellik glitters and sparkles, turquoise crystalline panes jumbled together, spines and spires stretching far out from the main mass.
Zaphrin is a fuzzy blue disk that glows with its own faint light. Patterns come and go on its surface, but are never the same twice.
Ashar is a tumbling near-black hulk, most easily spotted by the stars it occludes. It is, however, at least somewhat translucent - since it glows brilliant purple when it eclipses the sun every few hundred years.
Many theorists claim that adamantite, a greenish metal common only in meteors, is the remains of a fourth moon - destroyed by the titans at some point in the distant past.