Thule n. The name given by ancient geographers to the northernmost part of the habitable world. According to some, this land was Norway, according to others, Iceland, or more probably Mainland, the largest of the Shetland islands; hence, the Latin phrase ultima Thule, farthest Thule.
... passed, until one morning came the cry of "Land! Land!" and once again Ranulph saw British soil—the tall cliffs of the peninsula of Gaspe. Gaspe—that was the ultima Thule to which Mattingley ... — The Judgment House • Gilbert Parker
... name of a new tribe—the Caledonian Britons, who, according to report, lived upon fish and milk, clearly indicating a less advanced stage of civilisation than that of the tribes they had encountered hitherto. The unexplored territory in which they dwelt was vaguely called Thule. Tacitus, the historian, and son-in-law of Julius Agricola—the discoverer of Strathearn—imagined it to be an island formed by the meeting of the Firths of Forth and Clyde. But the time was now come when more accurate information was to be obtained concerning Caledonia and its inhabitants. ... — Chronicles of Strathearn • Various