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terra incognita

[ter-uh in-kog-ni-tuh, in-kog-nee-; Latin ter-rah in-kawg-ni-tah]
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noun
  1. an unknown or unexplored land, region, or subject.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for terra incognita

terra incognita

noun
  1. an unexplored or unknown land, region, or area for study
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for terra incognita

n.

"unknown or unexplored region," 1610s, Latin, literally "unknown land," from terra (see terrain) + fem. of incognito.

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Online Etymology Dictionary, © 2010 Douglas Harper