Definition of ultima Thule in English:

ultima Thule

noun

  • A distant unknown region; the extreme limit of travel and discovery.

    ‘the Orkney Islands seemed to be ultima Thule to the English’

Origin

Latin, literally ‘furthest Thule’ (see Thule).

Pronunciation

ultima Thule

/ˌʌltɪmə ˈθuːliː/