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Synonyms

terra incognita

American  
[ter-uh in-kog-ni-tuh, in-kog-nee-, ter-rah in-kawg-ni-tah] / ˈtɛr ə ɪnˈkɒg nɪ tə, ˌɪn kɒgˈni-, ˈtɛr rɑ ɪnˈkɔg nɪ tɑ /

noun

  1. an unknown or unexplored land, region, or subject.

terra incognita British  
/ ˈtɛrə ɪnˈkɒɡnɪtə /

noun

  1. an unexplored or unknown land, region, or area for study

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.