terra incognita

[ter-uh in-kog-ni-tuh, in-kog-nee-; Latin ter-rah in-kawg-ni-tah]
an unknown or unexplored land, region, or subject.
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World English Dictionary
terra incognita (ˈtɛrə ɪnˈkɒɡnɪtə)
an unexplored or unknown land, region, or area for study

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

terra incognita
"unknown or unexplored region," 1616, from L., lit. "unknown land," from terra (see terrain) + fem. of incognito (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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