A Flat Predictable World

The world known as Musto contains almost all terrains and climates found in the prime material plane. The night sky contains constellations from nearly all known worlds within the prime material. The sun and the moon follow the same paths in the sky, the stars are fixed, and seasons come and go as predictably as any clock, with only the size of the sun changing. The days are the same length. The sun and moon rise and fall at the same time each day. Water flows from a central source in the center of the main continent and out to the seas, which flow over an edge from which nothing returns.   

 Musto is a “flat” world, and no one really knows how it came to exist.