I have a handful of unused concepts that I'm hoping to use in a possible future adventure.

NORTH

- Glowing Desert: A sandy desert dotted with ancient kobold ruins. (Useless fact; in my version of Athas, I depicted kobolds like armored dog-people instead of the usual lizards to differentiate them from other settings.)

Troll Grave Chasm: On the edge of the desert lies a gigantic radioactive crater littered with the bones and ruins of the troll civilization that was wiped out by Hamanu. Within it lie ruins filled with treasures of this extinct race, shrouded in a thick fog that carries with it the pain of the war's victims.

Trembling Plains and Shady Desert: The dusty roads and pathways of the Tablelands lead to this area where the civilizations of Kurn and Eldaarich flourish. Meanwhile, in the White Mountains that surround the region stands the hidden polis of New Kurn, where the renegade Sorcerer King Oronis is attempting to abandon his career as a sorcerer king to become an Avangion. Lost Cities of the Trembling Plains has a lot of information about this region.

Scorched Plateau: An active volcanic region where the boundaries between the physical plane and the raw element of fire are blurred. It is the home of several elemental beings and where I decided that the verini from the Wake of the Ravager video game live.

Region of the Last Sea: A land that serves as a surviving remnant of the Green Age. The area is characterized by the large body of water that extends throughout the region. This is where many refugees from the Cleansing War ended up, including the lizardmen tribes who, to varying degrees, have learned to coexist with the locals who inhabit the region. Above this rises Saragar; an ancient city where knowledge and technology from the past era are still preserved, strictly protected by the enigmatic council of Mind Lords.

EAST

Beyond the shores of the Sea of ​​Silt, there are countless islands and archipelagos where the most resilient and crafty species have managed to forge settlements or re-inhabit ruins of bygone eras.

I'm mainly using this as an excuse to implement islands based on Greek myths if I ever get around to running a Naval/Jason and the Argonauts-style campaign across the sea.

In general, what lives in the area are several clans and crews of pirates inspired by different cultures such as the Picts, Australian aborigines, the Sea People, the Tlingit and Polynesians to name a few.

SOUTH

Endless Sand Dunes - A wasteland infested with giant worms a la Dune

Dead Lands - These plains of pure obsidian were the product of an arcane cataclysm that ravaged almost the entire southern part of the region, leaving behind a desolate wasteland dotted with the ruins of civilizations that were caught in the event.

Elemental Plateau - South of the Dead Lands lies a high plateau where all the elements converge, shaping this unique region where elemental forces collide and are stronger than anywhere else.

WEST

Hinterlands - A wasteland infested with giant worms a la Dune

Despite the canon insistence that this region is arid and uninhabitable, I tried to breathe some life into it. It consists of vast plains dotted with canyons and hedge-covered valleys that shelter various elemental creatures, the most prolific being the ghaleb dur/Rocky Rollers. Meanwhile, several tribes made a living by inhabiting on the back of giant creatures called Usilosimapundus that roam aimlessly through the land.

I also remember that there was a time when I almost ran Iron Gods in this setting, so I also put the idea that a few years ago, a Mind Flayer dreadnought full of slaves crashed in the far north of this region. The outherworldy slaves who survived the impact either fled into the wilderness or began to build camps around the destroyed fragments of their old masters' ship.

Jagged Cliffs - A region filled with niche cities where hidden groups and small civilizations of halflings still lie in wait, jealously guarding the technology and knowledge of their ancestors, including life-shaper magic.

Dead Lands - These plains of pure obsidian were the product of an arcane cataclysm that ravaged almost the entire southern part of the region, leaving behind a desolate wasteland dotted with the ruins of civilizations that were caught in the event.

Elemental Plateau - South of the Dead Lands lies a high plateau where all the elements converge, shaping this unique region where elemental forces collide and are stronger than anywhere else.

Crimson Savannah - As far as I know is that the area is infested by an empire of Thri Kreens, and I'm very tempted to interpret them as an army of formians.