Kar'thun

Kar'thun is a massive world with no oceans, replaced with countless lakes and rivers. Many of which as large as a small sea or as small as a simple stream and pond. Every region, lake, river and mountain is covered with life and saturated with magic.   Regions replace the roles of continents on other worlds, separating people and biomes. however they tend to be smaller and bordered by the network of global rivers that cover the planet. The region of Kar'thun come in two types, Kar and Kurn. Kar regions are balanced and maintain their natural states, nature keeping its hold on the land and dampening the Weave. The climate of a Kar region is dependent on the location relative to the poles and the equator, like other worlds. Kurn regions, however, are entirely different. The climate and life of a Kurn region is dependent entirely on which and what planes are "Close" to the space of the region. A region close to the water plane might be a fringed tundra, a region close to the shadowfell might be a gloom filled forest with a permanent overcast and muted colors everywhere you look. Fire, desert, etc. These regions also tend to be inhabited by predominantly magical life, and perhaps elementals. Fairies for a feywild forest, red dragons for a volcanic desert and unicorns for a holy place.   The Underdark, is arguably, larger and deeper then anything on the surface. Kar'thun is largely hollow, being filled instead with massive global networks of caverns filled with monsters, deep races and, if you go deep enough, illithid mind flayers.