Lost Landmasses
Lost Landmasses (or Disappearing Landmasses) are land formations that randomly appear and disappear throughout the Gabyverse for unexplained reasons. Some believe that the gods are basically just fucking with mortals for shits and giggles by doing this, but we will never know. Many land formations have existed throughout history that are now entirely gone, examples include Doggerland, Dwarf Island, the Lake Of Og, and most recently in Earth's history, New Togland.
Gustavolands is one of the only notorious landmasses that disappears with an actual reason, as Francis Friday has kept it hidden throughout certain points in history in order to ensure that Greasy Gus exists.