26 Lettered Earths, an alternate (and partial) D&D cosmography
A Brief Summary of an Explored Portion of the Orrery of Worlds (Earth edition, Keyed to the Dominant Late-Period Anglic Script, Translation Courtesy 3rd Gearth Expedition Force), or, 26 Lettered Earths:
Aerth - fantasy alt-historical Earth: the fun parts. pre-gunpowder (doesn't work, never will) but other than that all your favorite historical eras squished up against one another. Earth-Xena, Warrior Princess, if you will.
Bearth - Earth but populated by evolved bears and other ursines
Cearth - Celtic catgirl/catboy earth. the sidhe and unsidhe clowders alternate being "ruled over" by Tom Tildrum or Tim Toldrum. see also, the Taìn.
Dearth - not a lot here, kinda miserable and gloomy, scarcity reigns except for gunpowder, gasoline, and greed
Earth - our Earth. most portals or other means of transit are laden with "enter at own risk"-type signifiers
Fearth - horror Earth. gloomy and foreboding. all the little horror subgenres of the past two-odd centuries get their little Ravenloft-style demesnes but honestly i was thinking, like, 1970s-80s horror paperbacks
Gearth - clockwork, #steampunk, alt-Victorians, extremely tiresome except for the modrons! i love those little guys. and gnomes, of course.
Hearth - halflings came from here, it's pretty cozy
Iearth - crystals, psionics, high magicks, home of the IOUN stones
Jearth - something about the light casts everything in shades of blue
Kearth - possibly Korean Earth, a never-divided Korean Empire as a major world power and cultural force.
Learth - high Shakespearean drama! low Shakespearean comedy! Elizabethan swashbuckling! Enochian occultism!
Mearth - Wodehouse's world. quite droll for some folks, deeply off-putting to others.
Nearth - *almost* our Earth, but slightly off-brand. like the Canada of Earths.
Oerth - home of the Flanaess, the Circle of Eight, Vecna, the City of Greyhawk, etc. sports a deceptively stuffy and tedious surface over an amoral and murderous core. Oerth wasn't placed at the center of creation as its denizens claim, but they *are* awfully close to it.
Pearth - an odd, bottom-heavy planet, sparse population concentrated largely in the southern hemisphere, a strongly independent people who speak a deeply drifted dialect. everything also has a real juicy donk for some reason.
Rearth - Re-Earth. we started the whole thing over to observe it from the beginning, it's a thousand years behind and everything's gone totally off the rails, no supernatural shit but alternate history breakpoints ahoy
Searth - Sea Earth. more Momoa than Costner
Tearth - soap opera earth, everyone's always angry or overjoyed or crying for some other damn reason
Uearth - reverse map Earth. the lands are oceans, and all the sea is dry, dry land
Vearth - Vampire Earth? some iteration of the World of Darkness, maybe Monte Cook's WoD, that doesn't get enough love
Wearth - it's like the opposite of Yearth. the New Wave of science fiction, it's eternally 1979, the aftermath of the 1970s Logan's Run plastic disco cocaine utopia, everything's run down and they can't keep the lights on. the calendar year resets on January 1st,everybody knows, nobody cares
Xearth - fuck it, it's Gamma World, a superhero civil war blew everything up and now it's Gamma World
Yearth - it's the golden age of science fiction, all the major problems are solved and it's always 1965, the calendar year resets on January 1st and nobody seems to notice
Zearth - muppets. muppets on a on inexplicably donut-shaped torus planet of nerf and lego. whimsy level: virulent