Ultima Thule

Thule (also Thula, Thyle, Thylee, Thile, Thila, Tile, Tila, Tilla, Tyle, or Tylen—being Θούλη in Greek) is in Classical sources a place, usually an island. Ancient European descriptions and maps locate it either in the far north, often northern Great Britain, possibly the Orkneys or Shetland Islands, or Scandinavia, or, in the Late Middle Ages and Renaissance, in the west and north, often Iceland or Greenland. Another suggested location is Saaremaa in the Baltic Sea.
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Noun
1. the geographical region believed by ancient geographers to be the northernmost land in the inhabited world
(synonym) Thule
(hypernym) geographical area, geographic area, geographical region, geographic region

Ultima Thule (Latin) Farthest Thule, Thule being the Greek and Roman name of an alleged island somewhere north of Britain and considered as the northern limit of the habitable globe; figuratively, any ultimate goal.

The most distant Thule