Kaernest is a flat world. If you stood on top of the tallest mountain and looked out, (if the weather allowed it) you could see to the edge of the world. Just as the idea of a flat world seems odd to you and I, the travel of it's sun, moon, and stars would seem just as unusual to you and I.
(Physical description of the world and its geographies)
Old Kesh[]
Old Kesh is desert that goes from being quite mountainous in the west, to flatter and wider toward the east. There are sections of Old Kesh that are sandy dunes, but also large sections that are flat sand.