An Overview of the Map of Tarun
Map of Tarun, as it is traditionally depicted with East at the top. Popularized by Later Pashtoi explorers, the east-up orientation of Tarunese cartography follows the flow of the great Tarun River, the namesake of the continent (literally called "The Lands of the Tarun"). The river, a centrifuge for the development of civilization, trade, and a strategic chokepoint linking the North and South while bypassing the perilous central mountains, it's no wonder that the Pashtoi Confederation, one of Tarun's most influential nations, formed in the fertile Imu Basin in 698 Pestaran.
Tarunologists also speculate the source of the east-up orientation could also be a product of Jammuphobia. Another influential civilization formed at the mouth of the Tarun, which empties into the Jammub Water, the Jammubs were historically generally regarded as warlike barbarians. Thus, with the east on top, Jammub civilization, as well as the equally scorned peoples of the western rainforests, are depicted at the bottom of the world.