terra incognita

[ter-uh in-kog-ni-tuh, in-kog-nee-; Latin ter-rah in-kawg-ni-tah]

noun

an unknown or unexplored land, region, or subject.

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British Dictionary definitions for terra incognita

terra incognita

noun

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

Online Etymology Dictionary, © 2010 Douglas Harper