Midgard has its own dedicated page cus like yknow, Magnus Chase... but technically it should just be called Earth cus like Midgard isn't what ALL demigods call it, even if one group of Demigods call it that... PLUS Gaea... well exists and technically (yes I know, lots of technicalities or whatever) that's earth so Gaea, Earth, and Midgard are all the same, BUT the primordial goddess Gaea is different than Earth Gaea.
Hopefully, this all makes sense cus like I kinda confused myself lol.......OMG, I just remembered Geb is the Egyptian god of the Earth so ig his non-god form is the same as Gaea (non-goddess form), Midgard, and Earth.
If I made any mistakes pls tell me. OMG WAIT GEB AND GAEA TECHNICALLY LIVE ON THE WORLD TREE!!