Obsidian Coast

Supposedly the west coast (or at least part of the west coast) of Arddol. Tradition says that the mineral obsidian is common there.
Ettrean sages have long written about city-states on the Obsidian Coast, founded by refugees fleeing some tyranny, perhaps in Ypt or Omalo. Whether any of those scholars have ever visited the Cities of the Obsidian Coast is doubtful.