Kethira

Kethira is the name of a Planet, possibly parallel to Arda or Ambar, existing within Eä, but in a different plane or reality.

Comment
Kethira is the Setting of Hârnworld or Hârnmaster. The Planet Kethira is implied to be one of seven linked parallel worlds collectively known as Keléstia, the other six worlds (or Planes) are said to be Terra (or Earth), Yàsháin, Midgaad, and the Blessed Realm.The two latter of which correspond to Middle-Earth (or Ambar) and Aman.

See:
 * Kulthea