Mark World

The North is a snowy tundra region with impassable mountains with year round blizzards and deadly monsters surrounding it's northmost side, the northern people look down on the servants that people keep in the East and are generally "for the people". The North has deep mines, and each person is required to often give up their identity to help their village survive.

The West is a dense jungle region, with roads carved out like caves of roots and branches in the trees and brush, comprised of treetop towns and high elves. They are indifferent to the servitude that many races are forced into. Trees that hold villages have circuit like neon pipes running to the village from underground, as Cosmos Beetles are harvested when they burrow underground to sleep the underground labs capture and breed them, since the beetles emit a glowing mist that is harnessed as biofuel, allowing western tech to flourish.
The East is a rolling landscape of trees and grass/prairies, a very calm place, ruled by a Queen monarch who relies on the servants and "lesser races" to support her economy, which is why it's mostly thriving. The East has massive Deoright (matte midnight black material) pipes that spire into the sky, in a brutalist, wireframe pyramid shape, these are trade pipes that Easterners can use to trade and send messages between cities within minutes, and allows the capital to keep their vassals well supplied and well informed.

The South was once a massive oasis, porous rolling fields of grass and rock, with deep caves underneath, and many roads created using Waterstone to prevent ocean water erosion. In the caves, lots of mining happened, as well as underground speed tunnels to travel quickly between cities in the south. The caves flood at night, so many of the objects left there are waterproof. Though, now the entire region of the south has been barricaded/walled off because a massive monster infestation, like nothing else from any other region, tendrilous black mist creatures. Nobody knows why, but it became a desolate wasteland. Most of the people there died right away, some escaped. Few refugees or warriors continue to fight for their homes from the waves of monsters every day, but now it is a looters paradise. An entire great nation now picked apart by scavengers and brave adventurers.